You can't beat the classics.

I took a 'message' for Doofus this morning while she was out of the office. When she got back she found out that a Mr Behr (think about it) had called and could she ring back. Being a thoughtful chap he left his number.

Doofus gets on the case, rings the number that was left, which just happened to be for the London Institute of Zoology, and leaves a message on their answerphone asking if "Mr Behr" could call her back.

Well it's almost 1pm and he hasn't returned her call. I guess he must be busy.