Cap kissing Sharon, followed with the cut to Sam and Bucky nodding in the car. Loved that.
That was the funniest gag in the movie, shit had me cracking up a minute or two later.
Movie had tons of funny moments which was nice. The Russos seem to know when to use humor very well, too. Whedon completely undermined Ultron with all the quips he was spouting out when he should have been dead serious.