These are some things that make me grumpy.
-Students who don't take learning seriously -Students who don't take responsibility for their own work -Insincerity -Pretentious academics -Winter and everything winter-related, with the possible exception of hot chocolate and fuzzy sweaters -Constant complaint without action -Cheese puffs, black licorice, and catsup
That's all I can think of for now, but I'm sure I'll add more eventually.