Or maybe your lunch has been looted.
What do you do?
Lots of people will vent their anger in a Post-it note -- with lots of exclamation points.
But Kerry Miller says sometimes a blizzard of notes will backfire.
Miller is the author of "Passive Aggressive Notes: Painfully Polite and Hilariously Hostile Writings."
Miller says people think writing a note is the polite thing to do.
Like the time someone left an unsigned note that a young woman's attire was inappropriate for the office.
But Miller says often anonymous notes will just add fuel to keep a dispute burning.
