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Oh, how could I ever choose just one?! Some that come to mind right now are:
-People's over-correction when it comes to pronouns, when they end up saying "Him and I" "between her and I", "the man whom was..." and the dreaded "___ and I's anniversary"!
-People's ignorance of Latin leading them to use "per say" instead of 'per se'.
-People using 'literally' instead of 'figuratively', i.e. its exact opposite!
-Commas in plurals! I can't believe people still do this, or ever did this. When the Hell were these people told that a comma EVER goes into a plural noun? I can forgive ones like CD's, or 90's, but even those are superfluous.
-Okay, less of the grammatical ones (I am aware that nitpicky grammar people are on others' pet peeves lists!): 'woe is me' attitude taken too far. You're allowed to complain a few times about that cold, and you're allowed to wallow for the longest time if you've lost a pet or family member, but when it ends up that you're telling people that your headache's moved six degrees round your head in the past hour or you're complaining about being overworked as a student because you've got more than one thing to be getting on with, or you won't shut up about a goddamn cold and using the phrase 'FML' over it, things have gone too far.
-Sometimes it amuses me rather than annoys me when people don't practice what they preach. For example, a certain girl I know lost it when someone informed her there is more to do on the weekends than drink every single time, but later was asking everyone not to lose their temper so easily. Hmm.
I might come back to this; right now I have to meet someone, so I've been cut short of time!