The funniest one for me was years ago when we were living down South where I was working and we lived in a flat above a pet shop, at this particular time the wife was not fond of cats and would not have one as a pet or whatever.
Well, a mouse was running around the flat and the wife was petrified, laid down traps the lot but could not catch the bugger so I said to the wife we will have to get a cat, she agreed in the end, reluctantly, so I got one at the RSPCA discarded pets sanctuary, named Rumps, I year old.
The wife would not let Rumps near her because of cats hairs and after a week she said " So much for that cat catching a bloody mouse...", the next day I was in the kitchen and heard the wife scream, I went into the lounge and there was the wife sitting on our son's knee scared shit as Rumps was sitting on the floor with his tail swishing away with a dead mouse in it's mouth.
I managed to get it away from Rumps and headed outside to get rid of it and when I came back there was the wife sitting there with Rumps on her knee, CAT HAIRS THE LOT!!!! stroking him and he was purring away, the wife loved Rumps to bits after that.