Think

[Rondy]

In the men's room at work, the boss placed a sign directly above the sink. It had a single word on it: "Think!"

The next day, when he went to the men's room, he looked at the sign, and right below it, immediately above the soap dispenser, someone had carefully lettered another sign which read, "Thoap!"

[Spicerack]

Thilly thod.

[AZardoz]

"Think!"

Must have been an IBM washroom.