Remember when, as a kid, you used to copy everything a friend said? Well, you're not alone. Everyone played it, including the creators of fiction. It gets old very fast and, in some circumstances, is not even a game: it's just a way to get on someone's nerves. Obviously, this is exploited in comedy, with the end result "stop copying me!"... "I mean it!" Sometimes the victim will turn the table and force the perpetrator to either quit the game or say embarrassing things. This may still mean that the joke is on the victim, if the purpose of the game was to make them say embarrassing things.