This one is what what I have read somewhere a long time ago, but I forget the exact source. It is my re-phrased version.

One day, a secretary came to work with bandage on both ears. The boss asked him why. He said "while, when I was ironing my shirt last night, the telephone rang. I picked up the iron by mistake". "ok, that explains one ear", the boss said, "what about the other?" "While", the seccetary answered " when I was in a hurry, the phone rang again."