There are probably more than just these things. I'll add to this list as I think of them.
  1. The dust from package baking mixes
    I pour it into my mixing bowl, and dust flies up. I worry integral parts of the mix are going into the air and not into my baked goods.
  2. The microwave timer
    When you stop something before the timer's up, and you don't clear it out, so there's 0:03 left blinking on the screen. I hate that. PRESS CLEAR.
  3. Threes
    I like things in groups of threes. I track the number of syllables in conversations I'm having and I like it when they're grouped by three.
  4. My towels
    I fold them in a very specific way. I don't like other people doing it.