There comes a point when advertising IS crossing a line.
Sure, you have ads that flirt with the line. Some dance back and forth over the line. Some ads even say "here is the line, and I'm standing on it!"
But some of the ads (TV and print) that Burger King has been coming out with recently are WAY over the line. Like, they run, naked and screaming and brandishing a flamethrower, over the line.
Granted, (I think) this ad was never meant to run in the U.S.