At least here on the Las Vegas PBS, they put the disclaimer/warning that, “This program contains material that parents may find unsuitable for younger children.” before Antiques Roadshow!
Seriously?! Are they afraid children might suddenly develop a love for Tiffany lamps and turn Gay? Do they think kids are going to have nightmares because the chair was a fake Louis XIV?
Might be because some antiques feature nuuuuuuuudes!
That is weird. Maybe people get violent when they find out that they reduced their antique from $20,000 to $2000 by cleaning it up. 
That would be my first suggestion- Sure, it’s definitely Art, it’s almost certainly tasteful, and it was painted/sculpted a century ago, but I’m sure there are a lot of parents- even in Las Vegas- who don’t want to have to explain to their kids why “that lady in the painting” or “that statue of the lady” isn’t wearing any clothes.
Also, possibly, people might come in with “Darkie” memorabilia from a less enlightened time or something. Still a disclaimer seems a bit… overprotective, for want of a better term.
It’s Vegas, isn’t everything supposed to be brand new? Maybe antiques are offensive in and of themselves?
Damn. If Antiques Roadshow could be unsuitable for kids, I shudder to think what my husband is doing to our 10YO’s psyche by watching Pawn Stars when she’s in the room! Hell, think about it. Even the title is suggestive! 
ETA: OTOH, at least the guys on Pawn Stars are real manly men, so she’s sure not to catch teh ghey from them!
Anthony Bourdain’s show on the Travel Channel also seems to carry this warning. I guess once in awhile, it might deserve it, but it actually carries it when they return from every commercial break.
I’ve never really seen anything that bad on his show.
Would you want your kid whining incessantly for a tin Greyhound bus from 1935 that’s only available for $7,000 from some dealer in New York?
DingDingDing! I think we have a winner!
Also, Antiques Roadshow may contain substances known to the state of California to cause cancer.
Bourdain’s show usually carries a warning only when the have a scene of an animal being slaughtered. OF course I have never seen them actually show much of anything of the slaughter just a live animal, the Tony talking uncomfortably, the a cut to a dead animal.
Actually, I believe the first Bourdain show I saw happened to be the one at the Chinese underground ‘penis’ restaurant…
That’s all I can think of, though. Most kids I know have no problems eating bugs, or whatever else ‘extreme’ Bourdain can think to serve up.
I would guess that the most likely issue with Antiques Roadshow is that one of the paintings up for appraisal contained nude figures. Some people get very upset over that, so it’s best to run the disclaimer.
I don’t know about that. I don’t recall ever seeing a parental warning on an art history or art appreciation program on PBS, and they often show nude paintings and sculptures. Heck, back in the day PBS was the only place on TV you could occasional see real female breasts with nipples and everything, but I guess times have changed since then. Still, I would say it’s much more likely to because of the racial caricatures prevalent in old toys, mechanical banks, advertising, movie posters and such.