If you give a mouse a muffin, he'll come back after the bananas.
We've had mice several times through the years. A few years ago one had taken to traipsing through our dish cupboard each night and leaving unmistakable evidence of his travels. The only thing edible in there was a stick of butter on a saucer, and we quickly learned to keep it covered with a glass bowl until the eventual purchase of a handy dandy butter dish.
A former blog friend had mice earlier this year and the intruder had a banana fetish. Well, guess what? This mouse also likes bananas. I think perhaps he has an Australian accent.