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.