One house I never even asked to view had some interesting pictures of their bathroom. Complete with cat things on the floor. Well done cat for at least getting the right room!
Another house the owner told us she never used the gas fire in the lounge as it was too expensive to have on!
The same house she pointed out that if you took the radiator off the wall you could put a wardrobe there instead!
One house we viewed had a galley kitchen too narrow for a dishwasher. That one was off the list right away.