How badly did it turn out if you did? I once bought a SATA- USB transfer cable on Amazon to back up my friend’s computer. It was some brand I had never heard of, but I never thought brands mattered for cables. It melted and burned the first time I ever used it, and killed his hard drive.
I got 3 Rolex watches for $50, they might have been fakes.
My fake, Mexican Rolex’s are still humming along fine.
If I’ve ever eaten counterfeit Chinese meat, it didn’t injure me.
One of my Lightning cables used to cause my iPad to complain it wasn’t a genuine cable, but then that stopped happening with a software update. I still don’t know if the cable was fake or not – it was from an Authorized Reseller listed directly on locate.apple.com. But, still, China is China.
A fake GFCI breaker in my previous rental house faulted, causing 380 VAC to go to my outlets instead of the expected 240 VAC, or rather, the expected 0 VAC after a ground fault. It caused nearly everything on the first floor of that house to stop working.
Maybe the DRAM I put into my work laptop is fake. It works well enough, though.
One of my company’s valued joint venture partners manufactures what appear to be (although I am not alleging anything and have no knowledge) fake Toyota vans.
i bought a vhs back to the future at a thrift store and when i got home i saw that it was bootleg
lesson learned: always check the tape itself don’t just look at the cover
I don’t know if it counts as “bootleg” but I buy obvious copyright infringing Chinese made stuff all the time just because it is cheap, toys especially since my kid is pretty rough on them so if they break no big whoop. He doesn’t notice it isn’t GASP an official product.
I bought a fake memory card once. It cost almost as much as a real Sandisk, but had only a fraction of the capacity and was much slower.
I know a guy that bought a white powdery substance that turned out to be not at all what he was expecting. His first clue by four was a sharp burning sensation followed by bubbles coming out of his nose. I very helpfully collapsed on the floor quite literally ROFLMAO at him.
I’ve bought bootleg dvds. I respect copyright to the point where I’ll buy legitimate products when they’re available. But if the copyright holders choose to not release the works they hold the rights to, I have no moral compunction against buying a bootleg.
Not sure if you consider it or not, but I always have hacked my DVD players to go all-region. I happen to like odd movies, and not everything is available in US zone. <shrug> The whole zone thing is stupid, IMHO, why artificially reduce your possible sales by restricting my ability to buy and enjoy Asterix Gladiateur is asinine.
If it was a brand you’ve never heard of, I don’t think it would be counterfeit, just cheap (or knock offs), right?
Personally, I don’t think I’ve ever bought any counterfeit products but I did find some fake Oakley sunglasses once. I gave them to one of my employees. I think he wore them for a while.
Ordered a Chinese bootleg version of Patrice Chéreau’s 1976 staging of Wagner’s Der Ring Des Nibelungen. On eBay. Hey, it was cheap, I was young, and the thing worked just fine.
Bought an Immortal bootleg CD once. Bad idea, that. Volume varied wildly from one track to the next. Practically unlistenable.
“Counterfeits” and “brands you’ve never heard of” are different things. Both counterfeits and knock-offs are very common in Thailand, but merchants are often upfront about it, distinguishing their different types of good. Very few who buy “Rolex watches” or “Gucci purses” here think they’re getting legitimate goods. (Some foreigners stock up and retail in Europe where, apparently, many end-buyers are misled).
If you buy a “master DVD” outside a big-name retailer, it’s not a copyrighted original, rather it’s an illegal copy of such an original … called “master” to distinguish it from a copy of some guy’s CD created with a camera in a theatre! (Again, there’s no “dishonesty”; they’re happy to explain what they mean by “master.”)
You have to be careful though. Knock-off cellphones and smartphones sometimes appear with counterfeit logos. I’ve been bitten by Kingston flashdrives, which were a scourge until recently – I eventually learned to drive an hour to find a store which sold real Kingstons. The fakes might store a fraction of their rated capacity reliably but no more; I tried formatting them which AFAICT rendered them permanently useless. (The real Kingstons have a numeric code stamped on their USB socket, but you need to destroy the packaging to see it.)
And … my friends and I were happily buying “master” DVDs for about $2.50 from one shop which after 2 years or so suddenly disappeared. About that time, the film on those DVD’s began disintegrating. Serves us right! 
A high-quality blank DVD costs about 12 cents or so, but that guy had apparently found some for 5 cents.
There’s a lot of bait-and-switch with small electronics and related items on amazon. Always check where it’s coming from; if it’s shipping from Asia, you’re probably not getting what’s in the picture.
I like Rayban Wayfarers and own a few pairs. I saw some on EBay that I was skeptical about. I made a low bid, got them, and found them to be counterfeit. But they are very good counterfeits and I was happy with my purchase.
My wife asked me to buy her some purse (Chanel?) for her birthday from some site with a ridiculous name like name-brand-purses-great-deals.com. So I ordered it and saw that it was shipping from China, but she said she didn’t care if it was a knock-off. Which it, of course, was and rather amusingly it literally fell apart after around two weeks. Who would have guessed for a $30 purse “valued at” $500?
I was more concerned about credit card fraud or something as a result of my order than shitty build quality but, luckily, a shabbily made purse was the only result.
When we were on vacation in Italy, it felt like every square foot of sidewalk in Venice and Florance was covered with counterfeit purses and leather products. My wife was probably tempted but we didn’t want to deal with a potential customs hassle.
Plenty of store brand groceries, but I think what the OP is talking about is a product that is labeled and represented as being a brand name product, but isn’t.
Like when you go to a Shell station and you think you are getting gasoline that was refined and formulated by the Shell Oil Company, but you actually get gas that was delivered in the same truck that supplies the Handi-Punp convenience store down the street.
It is not a “counterfeit” when I buy my clearly-marked store brand of aspirins and it says “Compare with Bayer” on the label.
I bought a “Rollex” watch in Korea.
It lasted for about two years.
Kept good time though.
I have bought bootleg DVDs in the past.
However, with RedBox and Netflix streaming now, I don’t bother anymore as there are few films that I can’t wait to see.
I bought counterfeit weed when I was younger.
It wasn’t intentional and I wasn’t happy with the product.
When I was 16 on a class trip to New York City we were in Chinatown. An Asian lady stepped into a doorway, opened up two briefcases full of Gucci, Rolex, etc. watches and said “Hurry up.” I said, “How much for the Gucci?” “Fifteen dollar. Hurry up.” We snapped up our watches, she snapped shut her briefcases and disappeared into the crowd.
I wore that watch for quite a while, until I stopped working and I couldn’t be arsed to change the battery.
That’s a good clue it wasn’t a Rolex. 
I still have a counterfeit copy of Introducing… The Beatles that I got about 40 years ago in a cutout bin at a local discount department store. The vinyl quality is pretty poor, but for $1.49 or whatever, it was a good deal.