Someone I know used to work for a small town newspaper. The boss was a twerp who tried at every turn to ingratiate himself with the staff. They in turn found him of little use.
While most everyone was at lunch one afternoon, he took a call for a last minute ad to go in the following day's edition. A shoe store wanted an ad highlighting their big sale and wanted mention of their special senior's discount.
Mr. Bossman rolled his sleeves up and did the typesetting for the ad himself and crowed the rest of the afternoon to everyone about his fine work.
Although the proofreader saw it, he didn't say anything. The ad ran:
Big Sale On All Shoes!
Seniors 10% Discocunt