The thing that tickles me is when they say it as an actual word!! My daughter (12) does this a lot. I may be wrong but I'm sure I heard it mentioned that this is actually a word in the dictionary now, and one of the few words that is said as a word rather than just used as an abbreviation.
I don't say lol but I do put lol, it's not so much a laugh, more of a comical sound
However, I do say CBA (a lot!) It's more polite than the words.....