Callum thinks you got off on his Plunga! video and doesn't like people seeing him humiliated. So, dressed in protective waterproofs to ensure he can't get messy, he is going to get revenge on you for every video that you have watched of him. You are placed in the gunge tank and after a bit of teasing, he pulls the lever and gunges you. Then, he reveals that he is leaving you in there to go home and relax...
Callum wears camo army gear and has to pull the lever on himself inside the gunge tank, which incidentally is filled with 50L of green gunge. After a tanking, Callum appears wet and sticky and pulls the lever for a second tank over himself. Includes slow-mo replays of all angles at the end. This is a custom video from LiquidX...
Callum gunges himself in red overalls/boilersuit with very gooey green slime. There's being gunged, but then there's pulling the lever yourself which makes the feeling so much worse...