We have two moggies, now aged 15.
In my experience, a cat will bring in an assorted range of items including...
socks
teddy bears
goldfish
frogs
worms
mice
birds and
a butcher's hook with a ham
They can give you, and your entire house, fleas
They will choose any surface to throw up on, but only if it is absorbent, and preferably dry clean only. Carpets, duvets, and expensive school blazers are a favourite.
If your cat is white, it will automatically choose to sleep (and shed hairs) on a dark surface. If it is black, it will do the opposite.
As a kitten it will climb up your curtains and swing manically from side to side, until your curtain rail falls off.
As an adult, it will forget it has ever, ever, ever been fed even though it is now almost too fat to get through the cat flap.
But they will bring you so much fun and I love mine dearly. I will be very sad when the time comes to let them go...