Kind of rude that for the ladies he's just saying it to their backs.
Forget the little gift bag. Forget the custom t-shirt or hat. Forget the novelty inflatable genitals with your bachelorette party's name and date on them. This is now the gold standard (certainly the yellow standard of some kind) for showing people your appreciation for their attendance at your shindig. The details behind this are hazy, and by hazy I mean non-existant, but this is one of those cases where I don't think there's really a lot of mystery involved: some kid had a party, printed out his face with a speech bubble, and taped it to the toilet. Because this is how the world works now, it wound up on the Internet. The End.
(by Johnny McNulty)