I can now in my infinite wisdom (from repeated experience) recognize symptoms of my own sleep deprivation and bite my tongue before I'm overly snarky to students just being kids. For the last couple of days, I've been subsisting on a lack of sleep (welcome to a teacher's world) because I am blessed with tons of meetings and tons of tutoring and tons of materials to make up for each day.
So. One of the symptoms is going off into that glazed-eye stare and fantasizing about COMPLETELY inappropriate ways to deal with rude teenagers (not in class, but say oh .... lunch line cutters / liars / hall wanderers / litterbugs ...) and all the while in my fantasy having an evil grin on my face. mwa ha ha ha, take that, you inappropriate child!
Someone needs some sleep.
Okay, you also know you've taught in high school for too long, when practically any innocent thing you say has some sexual connotation (sp?). While I'm in class and trying to get kids not to yell out answers .... so everyone has a chance to think and respond, and I can get a better sense of how many and who knows what .... we were doing something with graphs, and they had to name which OTHER quadrant that sine was positive in. So I was having them hold fingers up close to their chests signifying 2, 3, or 4. I said, "okay, put your fingers on your chest" ... pause .... tee hee hee hee "okay, don't finger your chest, but put your fingers NEAR your chest to ...." . Oh my.