A man learned shortly before quitting time that he had to attend a meeting. He tried unsuccessfully to locate his car-pool members to let them know that he would not be leaving with them. Hastily he scribbled a message to one of the fellows and left it on his desk.

"I have a last-minute meeting. Leave without me. Dave."

At 7:00 pm, the man stopped at his desk and found this note: "Meet us at the bar and grill across the street. You drove!