I can't stand windshield wipers still going after it's stopped raining.

Also a few linguistic ones:
--It irks me when people use the word 'myself' when it's neither reflexive nor emphatic (e.g. When you're done, hand the form into Tom or myself)
--I'm bothered by some backformations to make words for things that already have words (e.g. orientate)
--I don't like it when people say 'irregardless' rather than 'regardless'
Of course, as a good descriptivist, I do my best to accept language change, however irrational it may be at times, but some things do get under my skin.

Ajax