Hah!
A neighbour's former half-Siamese used to come in, eat the girls' food, piddle on the furniture and break into my greenhouse to help himself to the catnip. A right little sod!
OTOH, I used to have a cat who used to go and visit another neighbour. He'd wait outside their front door, singing the song of his people until he was let in. He'd eat their cat's food, use his litter tray and keep them (and the three kids) company while they ate their breakfast. When they moved out, he did the same with the next lot of neighbours. Except they didn't have a cat LOL.