Mark Conquers His Fear of Night Swimming

Summary
Mark and Ethan go for a late night swim in Fischbach's swimming pool where he will attempt to conquer his fear of swimming at night while Ethan taunts him as the Gongoozler, a made-up monstrous sea creature that stalks its prey from below the surface. In a post-credit scene, Ethan, portraying the aforementioned creature, swims beneath and pulls Mark into the water moments before the video comes to an end.

Fake-out endings

 * Mark enters the pool and decides to give up. He thanks his audience for watching and asks the editor to transition onto the outro timer, which slowly grows more high pitched and rotates, before the video resumes a few seconds later.

Trivia

 * In the real world, a gongoozler is a person who enjoys watching activity on the canals.