"Grounded Vindaloop" is the seventh episode in the eighteenth season of the American animated television series South Park.
The episode lampoons virtual reality headsets including the Oculus Rift using various science-fiction movie references, and customer service call centers.
Butters becomes so convinced that he is in a VR setting that he goes home and punches his father Stephen in the genitals as payback for being grounded, steals a car in the style of Grand Theft Auto, and tries to assault a prostitute but gets stabbed in the process.
Cartman confronts Butters, as he's now grounded, about the call from Oculus Rift and threatens him by saying that whatever happens in VR happens in real life.
Cartman and Kyle meet with Stan, who is on the phone with Steve, and Kenny, who is unconscious and hooked up to an Oculus Rift.
[1] On the DVD audio commentary for "Grounded Vindaloop", Trey Parker and Matt Stone discuss how the episode started: a drawing of Butters in the fake virtual reality headset that Cartman would use to mess with him.
Parker said "It just seemed like such a natural way for Cartman to fuck with Butters by putting something like this on his head and telling him that he was in virtual reality when he really wasn't."
One reason they stuck with it was because this idea of Cartman fooling Butters for his own entertainment had worked so well in past episodes, citing season seven's "Casa Bonita" as a good example.
[2] Another influence of the episode was the fact that Parker and Stone had been discussing doing something South Park related with virtual reality tools.