From somewhere ages ago and I find myself doing it by reflex now, that's like the only one of those I ever really used but boy did it stick. The little bit of offset on the eyes in most fonts really gives it that je ne sais quoi that I crave.
It's pretty neat to me that we've created this weird language around laugh onomatopoeia.
There's a very different tone and meaning between "ha", "hah", "haha", "hahah" and "hahaha", and I think most people can pick up on it with very little exposure without ever actually being told the difference, or even being able to explain the difference in words. I'd be willing to bet that 30 years ago, it would have been far less of a ubiquitous experience.
When you're using push-to-talk in a voice chat lobby, and someone tells a really funny joke. Do y'all mic up so the homie knows you think they're funny? Especially in lobbies where everyone is using PTT it can be really awkward when someone tells a joke, there's silence for a second or two (while everyone laughs off-mic) and then one person meekishly keys up with a "heheheh"
Me and the boys usually use voice activation but on the occasions when there's ptt in a game or we went ptt for whatever reason we always mic up for the giggling
Aw boo, the damn thing won’t let me load a video of me laughing to this joke, which would be kind of a mediocre chuckle where you could sense a subtle lack of sincerity.