In a chemistry class being taught by Professor Ron Rich, around 1953, several students arrived one morning to find that someone had written on the blackboard: “All classes will be dismissed today.” Knowing it to be a prank, they sat down and waited for the rest of the students to arrive.

One by one, others came in, looked at the board and sat down. Then one student decided to modify the  message on the board. He erased the “c” from “classes” and returned to his seat.

Soon everyone but the professor had arrived. Then Dr. Rich walked into the room and looked at the board. Noting that someone had already modified the message, he further edited it. He erased the “l” and walked out.

(submitted by Galen Tieszen, Wellington, Kan.)