Here's what I've been working on lately. I tried to show a change of emotion in a character (partly inspired by the character Clayton from 'Tarzan') and to see how easy animating a laugh would be. Well, the laugh was NOT easy.
I'll add a background and some color and possibly another shot in which to show the reason he's laughing.
As for reference for the laugh I used some of the examples in T.A.S.K by R. Williams and also a bit from a pencil test done by Milt Kahl.