Although I only laugh out loud when something strikes me as intensely funny (otherwise, I barely crack a polite smile), I have e robust laugh, and it's a true HA-HA sound. It's especially good if I laugh to the point of tears, but when I get to that point, I also snort. Unfortunately, some of the things I find intensely funny, others do not, so I'm usually laughing alone. One example is the time I was talking with my mother, and for some reason I forget now, she said the word "nanny." Well, my god, I found it extremely humorous, and couldn't stop laughing for a half an hour, crying and everything.
I make my poor cat nervous by laughing hysterically at her face when she rests on my chest, then I'll laugh harder because she gets an irritated look on her face due to being bounced up and down -- and I laugh harder still when she zooms off my chest and hides under the bed.