My former housemates had a cat, they moved out and took said cat. Cat had fleas which I wasn't informed of.

Cleaning out the now vacant room with a can of flea spray in hand I utter:

"Now, my uninvited friends, sooner or later, even if I have to do it individually, by hand at times, I will find you all and I will squash you for I am a software developer and I deal with bugs all the time."