Sarcastic remark used to let somebody know that their promises of fun haven't materialized, and that if this is their idea of fun, then they have a very twisted concept of what "fun" is.
Dad drags his son to a museum, promising that it'll be fun. When they arrive, the son is, unsurprisingly enough, really bored.
Family vacation in car - child in backseat calls out repetitively, ad nauseum, "Are we there yet?" This phrase is generally followed by ultimate adult frustrationa and the phrase, "Don't make me pull this car over!"