South Park airs a short GTA 6 beach sequence
Quick summary
VGC reports that South Park’s 28 October episode includes a brief GTA VI beach sequence. The scene depicts Jason fighting a dog owner and using a bag of dog waste; it does not confirm a general game mechanic.

Insider Gaming’s Mike Straw reports that Rockstar is thanked for the gameplay in the end credits of “Guinea Pig on a Stick”. This attribution comes from his report on the episode, not a separate Rockstar announcement.
