I fake yawn if they're looking and pull faces like I have tourettes or something if they look away.
I also drag my foot when walking away from a person I've just spoken too or walk like a zombie, closing my eyes and forcing myself to stumble.
Consequently, I trip alot.
Also if I have a weird social exchange, I'll walk away and slam myself into a wall or repeat our conversation in a chirpy voice as if scolding myself for speaking.
Its alot like,
"Hello Kelly, how're you this morning?"
"Good, how're you?" *D'oh, what'd I say that for?! I sound stupid!*
"How was your night?"
"Good." *That was a bit high-pitched, better tone it down next time.*
Its really ridiculous.