The expression "cue the deer" comes from
Funny Farm, in a scene where a couple were showing their home to
prospective buyers. The sellers wanted to make their home as
attractive as possible. As the potential buyers were approaching the home, Chevy Chase's characters says "cue the deer" into a walkie talkie and a small deer is released from a cage and scampers across the lawn, charming the socks right off the buyers.