Oh, that is bloody genius! *PMSL*
Another good one is to nod vigorously, and say 'He was behind the couch. Now it's my turn.'
The best one in my personal experience came when the WB had just started running Tiny Toons. A couple of said callers came to the door of the group house I was staying at, just
before the show was going to come on. The person who answered the door said 'Yes, we'd love to talk to you - but Tiny Toons is coming on. Could you come back in half an hour?'
Never came back.