When one extends a situation to the extreme so it is rediculous, or takes a joke too far so that it is not funny anymore.
Person A: Hey, how much playing time does Person C have on MW3?
Person B: Like 20 days! Hahahaha!
Person A: Yeah, like 10,000 days! Hahahahahahahaha!!!
Person B: Oh wow, you took it too far - you've got Rory Syndrome.