Laughing by yourself?

[ItalianFX]

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I laugh alone all the time...if something is funny enough to make me laugh, why should I care if i am alone or with others? I dont get it OP.

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I don't mean hold it in and don't laugh because everyone is going to make fun of you. I'm saying that I don't understand why someone laughs out loud when they are by themselves when a small chuckle or smile will still make you feel happy.

And just as I'm writing this, my other roommate is doing the same thing, however, I know when he does it, he's going to yell at me to come check it out.