Pet peeve: Being short enough to hit my head on cupboard doors people leave open. I was looking out our kitchen window to see if the trash was brought to the curb and clipped myself good, just above my right temple. Didn't bruise, but I got a slight swelling that hurts still. At least my hair covers it.
Bonus related peeve: having a knot on my head where I lay my head on my pillow. FFS!