similar to Laura
When working on call, for a big company, there was this painfull operator, who would call you at 3:00am with a very slow voice, like "Hello, Pete ... Hope ... you .... are ... well ?".
One night, 3:00am indeed, said bloke rang on the mobile, unfolded his 3 mins long "hello" protocol, and then said: "wait, ... oh ... bummer ... I was after the other support group ... wrong ... number ... hope you'll sleep ... welll ... good night."
I was so upset I could never sleep again that night ...