I once was looking at a pair of sandals in a shoe store, and the clerk/manager/owner was nearby. I looked at the price ($20) and kinda mumbled, “That’s too much.” He must have heard me, and offered them at $15.
I took them.
Hmm, I’ve never negotiated furniture. Actually, now that I think about it, I bought 100% of my furniture online. Hard to negotiate with Amazon and JCPenney.com. But yes, jewelry always.
It’s funny. I run a used building supplies store and I negotiate prices a dozen or more times a day. But I almost never do in other stores. Maybe if I’m at the flea market or a yard sale, but never in a big box store. Mostly I’m just tired of it from work and don’t have the energy.
It occurred to me that I haven’t worn it for a while. I’m wearing it today. 
This was my experience as well, back when I sold TVs. We’d always get people who wanted us to give a discount on the floor sample even when there were new ones in stock–typically not seeing (or refusing to acknowledge) that there was simply no reason for the store to do so; it made more work for us, and reduced our profit (and commission). But there’d always been one part-timer willing to do it, and then not willing to go get another TV and put it out.
At Sears, we had a specific policy against selling floor samples of non-discontinued merchandise, discounted or not, unless it was a customer service issue (say, if a customer had been promised a set on a given date and we had not been able to provide it), because selling the floor sample was stupidly inconvenient.
Only ever did it once. Recently I went to a store looking for a particular bag they had two colours in stock, only one I wanted and it was the last one. When I took it down I realized a zipper was broken and showed it to the owner (small local store) she immediately took off ten percent.
I don’t usually haggle though, don’t enjoy it at all.
I bought a hardcover book at Borders back in November - the back cover was bent, so I mentioned it to the cashier (this was the only copy in the store, and Barnes & Noble didn’t have it either). She checked with the manager, who offered the book to me at 20% off. I countered with 25%, but he was firm. I still bought it, because I needed it for research that week.
I try to negoiate when I can…though it usually doesn’t work. You need to be talking with someone with the authority to negotiate or it is a waste of time.
The 2 best were:
Wilson’s leather - My wife was buying a coat and so I was looking over some coats when my eye fell on a neat looking light leather jacket. I put it on and it fit well and was sooooo light. It was like I wasn’t wearing a jacket.
Looked at the price…$795. Holy smokes! Put it back.
Bottom line, walked out with it for $175 plus another $75 in ‘extras’…so $250. I can only assume the manager was getting some incentive for selling extras.
Still have the jacket 12 years later and it is still great!
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In Cody WY (near yellowstone) I walked into a art store during it’s last week. I ended up with 3 pieces that were marked at $1150 altogether for $150. 
Still have them on the wall to
I like negotiating. I used to really suck at it. I am better now but still don’t feel I am that good. It’s hard to get people to actually negotiate…the culture seems to view it as crass and negative.