SQUEAK
Mice were vermin. They destroyed crops and seeds and were generally a nuisance. Carter hated them. When he found them in his underground lab, he got rid of them.
One wily mouse proved troublesome. Carter tried poison. Traps. Cats. Heidi the German shepherd. He even tried to shoot it with a pistol and set out explosive booby traps.
Nothing worked. Outsmarted by a dumb mouse. Boy, did he get teased about that!
The next time Carter heard a squeak and saw the telltale clipped ear, he just rolled his eyes and sighed.
"Fine. I guess I can use the company."