There's a mouse in my house...

Get a trap to catch a mouse. They're inexpensive, and you can find them at most retailers. Just put some food on there as bait, preferably a small chunk of cheese. I've done this before, so typing this from experience. When I awoke the next morning, the mouse was caught, and it was a white mouse with light brown spots. Pretty cute looking, too bad it's eyeballs were literally being pushed out of it's eye-sockets because of the pressure from the trap. It was dead, and the trap worked. Profit? Not really. You just killed a mouse and got rid of a rodent problem, and lost money spending it on a trap.