Well, usually I laugh behind my hand and giggle, you know?
"Mhmmhmmhmmhmm" or whatever the onomatopoeia would be for that.
But sometimes when something's unexpectedly funny it's
"Pffftthahehehe" [or whatever].
And when I feel bad for laughing, like seeing babies or kitties on America's Funniest Home Videos it's more like
"Oooohohoho..." [er... yeah].
. o .;;
