Spatulas with overly-long handles. Nothing like constanty banging it all over a small kitchen.
Those little lights made to look like light switches, with their weak-ass magnets.
Clamp lamps that have scant threads on the reflector. They like to pop off and can actually instakill an incandescent.
As far as a house itself: installed carpets. It's everything you hate about carpets, but permanent. They're especially loathesome in bathrooms.