Dexter's Rude Removal

Throughout the course of the series, Dexter's Laboratory was no stranger to "adult humor," sneaking in sly references to things only Mom and Dad would understand. But there are subtle, racy allusions, and then there's the secret unaired episode, "Dexter's Rude Removal," in which Dexter's sister straight-up calls him a "skull-fucking douchebag."

The episode was designed as a treat for adult fans of the show, reserved exclusively for comics conventions and other special occasions, and has never been (and will never be, according to series creator Genndy Tartakovsky) aired on television. As a result, only a few people claim to have seen it. The episode is so peppered with explicit profanity that South Park would blush, and Cartoon Network won't touch it even for a late-night time slot, when it can pretty much air an interspecies orgy with the cast of Madagascar and get away with it.

These kinds of in-house gags aren't exactly new. As far back as the 1930s, Warner Bros. was amusing itself by making Porky Pig swear. But what makes Dexter stand out is just how far they went. The plot involves Dexter inadvertently creating evil clones of himself and his sister Dee Dee, and for the rest of the episode, the clones unleash a torrent of profanity at each other while flipping off and mooning the audience. At one point, while eating dinner, clone Dexter tells his mother "this shit is fucking great," after which clone Dee Dee scolds him for "fucking cursing in front of fucking Mom."