...I was going to write "lol" but, now I think I might get flamed!
Seriously, though, only ever out aloud if I and my group of friends are pissfarting around. Then generally we are playing with words, reference jokes, internet slang and the like. In that case, "lol" becomes more a silly reference joke that inspires laughter rather than an expression of laughter itself.
Honestly though, why WAS "lol" adopted as text-speak for "laughter" instead of, say "haha" or even (dare I say it) "larfs"? I don't know, when I was a kiddly I struggled to learn all the text speak stuff, it never really seemed to make life easier...
Anyway, that's my gripe with "lol"
Haha.