At the Yeh Jawaani Hai Deewani trailer launch, Ranbir Kapoor forced his buddy and director Ayan Mukerji to bare his chest. And this dostana became more of an embarrassment for this Wake up Sid director, no? But Ranbir seems to have a penchant for these kinda antics. Remember he mock-kissed director Anurag Basu at the launch of the Barfi! trailer? Naughty boy!