people chewing with their mouths open...drives me insane...
people driving down the road with their turn signal forever blinking...drives me buggy...
the misuse of the words your and you're...or their, there, and they're...
bad manners...
i work at a computer training center and my biggest pet peeve about our students...i bake otis spunkmeyer cookies every afternoon. they have to cool for 10 minutes when they come out of the oven...it never fails...i could have note upon note surrounding the cookie trays that say these cookies aren't ready yet but there's always someone who comes and tries to steal a cookie before i've put them out on the tray. when that cookie hasn't had enough time to "set up", it tends to fall apart and then leave a trail of oowey gooey choclate running down the cabinet...ACK!!!!! drives me nuts!!!!!
i could go on and on for days about my pet peeves...