One of biggest pet peeves is when people say" Lol", either say "lol" or "LOL".
Obviously people don't really laugh out loud, it seems to me more of something you say when something is just remotely funny, such as "my friend spilled his drink on the floor at mcdonalds".
lol
every now and then if something is REALLY funny i will literally roll on the floor in laughter but if like on XBL halo someone says something and its funny i cant stop laughin so lol but yeah
edit
oh and when someone lmao's or lmfao's do u really laugh yer ass off.....literally...?