For the things I write on the intronets -- I often will sit in my chair and laugh and laugh at what I write. I'm guessing this has been going on for me for about..... well since 1996.
For the things I say off the internet - *sometimes* when something strikes me as hilarious and I'm trying to tell husband or a friend, I will laugh so much I can't get it out. But most of the time I think my humor is very deadpan, sarcastic, biting, sly or silly. I very rarely tell jokes, like ones that are long and have a punchline -- often my timing is off and I can't remember the whole story.