Borrowed a friend's vacuum with a beater attachment for (oh dear) shag carpets. Cat hair got tangled in the beater brush and without thinking or turning off the vac, I stuck my hand in and freed it.
Had to get to the wall and unplug it to free my badly bruised fingers, hand and arm - all a lovely shade of bluish purple. Nothing broken tho I don't know how.
Stupid! Stupid! Stupid!