a few nights ago, a car alarm went off in front of my house for 20 minutes. at three am. it was a honking car alarm. i was pissed off for a full 24 hours after that.
another irrational (yes, i can admit that its ridiculous...see how mature i am?) peeve i have is motorcycles revving.
i dont think i was sensitive to either of these sounds until i lived in San Francisco right by the Broadway tunnel and would listen to motorcycle gangs roaring through it all night. god, that was miserable.