On Monday I said to my boss, "I have a dentist's appointment this afternoon. Can I leave at 2.30 and make up the time later in the week?"

"No problem," he said.

On Friday he pulled me up and said, "What's this? You've put on your timesheet that you finished at 5 o'clock on Monday."

I replied, "I know, I told you I'd make the time up."
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