How do i make this guy laugh?

ok there's this guy in my cl(i,m in private school) he almost 16 n im almost 14.Me n this other dude is trying to make him laugh.He loves marshal-arts (IDK how you spell that) but anyway we have never seen/herd him laugh we've been doin funny stuff and he'll just smile.He's not ticklish i already tried that.I also tried to knock a ball out of his hand and he's too fast 4 me? what do we do?