Does this make me a bad person?

Many, many times I've been pleasantly surprised, maybe even thrilled, on the internet, read: DiS.

Internally, big smiles. Big internal chuckles. Never out loud.

Also: I'm kinda put off by anyone who does LMAO from internet post. I mean, OK, there was that one time Wishpig wanted to name her band Buy Me An Ice Cream, You Cunt...the Lemon Shark to the vet thing, obv, and my response might have been audible... but I couldn't swear to it.

What's the acronym for big internal chuckle?