Why? Because shocking a crowd into laughter is a lot easier than actually coming up with jokes, or at the very least, witty banter.
"Even though we're in the movie Friends With Benefits, we've never dated, Timberlake told the audience. Kunis added: "We're like brother and sister."
"[We have a] totally platonic relationship, which is why I can do this," he said, grabbing her boobs. Kunis then cupped Timberlake's junk.
Kunis then announced, "and the winner is…", and Timberlake interrupted, "I think we just found out. What a shameless reference to my penis!" Yeah, maybe if the category was "Most Used Tool in Hollywood."
Why stop at groping? Why not just have a full on orgy onstage with every Hollywood starlet you've been rumored to be dating?
The entire bit was reminiscent of Paul Rudd's groping moment at this year's Spirit Awards. As part of a scripted act, Rudd groped fellow presenter Eva Mendes.
An outraged Rosario Dawson got back at him by grabbing his penis. Because if anything will teach a man not to feel up a woman its stroking his penis.
Overall, it may have stolen some laughs from people, but all in all, it's just another reason for straight men to hate Justin Timberlake.