When my friends are on chat but I'm not allowed more than 5 minutes on the computer (i.e. now).
My phone telling me my bill is available or something even though there shouldn't be any bill because I don't make calls or texts and I only use my phone to listen to music
When I find something in a book or whatever that I also put in one of my failed stories
When people misuse apostrophes, especially when pluralizing words. This is an ongoing pet peeve with me, but there are days when it irks me more than others for some reason.
When Coffretchi talks in the Tamagotchi! anime. I usually pay no heed to her but then she start chattering super fast forever. It's supposed to be funny but it is highly irritating.
When a song gets stuck in my head and I want to know the rest of the lyrics but I completely forget the song when I get to the computer to search for it.