That will show him

[five one]

I visited my mother (named Susan) at her office once and found a stapler in her desk, with a message sellotaped along the top: "This stapler is SUSAN'S, dammit!"

Ha! All my pens at work have a piece of tape on the top that says, "This is not your pen, Pat". Pat is my boss. I still find my pens in her office. She signs something at my desk and then just wanders away, pen in hand.

My tape dispenser and stapler both have my name on them, too.