He had to laugh....I mean look at the disciples, they were hilarious! Look at when he raised Lazarus....Martha was completely believing he could bring him back to life, but was worried about the smell! I mean, he'd have to have been made of concrete not to laugh at some of the situations He was confronted with. PLUS the fact that people were drawn to him like flies, he had to be a pleasant person. No one wants to be around someone who is a sourpuss. Plus, I'd like to think He laughs at me, rather than what I suspect....rolling His eyes and wondering "What was I thinking?"
Anyway, I have absolutely no Biblical references for that, it's only my opinion, other than the times the disciples were hilarious, and the time He raised Lazarus.