When we went to visit my sister, she said we mustn't, under any circumstances, let their cat in, as he would be a nuisance all night.
So, we got in bed, and the cat came to the window, waving his cat arms around and making squeaky sounds on the glass with the pads on his feet. For hours and hours!
We gave in eventually and let him in, and he thanked us by doing a huge poo in sister's kitchen, just at the bottom of the 3 steps leading down into the kitchen.
Brother in law (not known for his sense of humour) got up in the morning, down the 3 steps and trod in the poo. 