“Come swim up and down this wall with me” (he has no idea! XD)

A friend and I were hanging around the training area, and while we were waiting for more friends to join us, I got really bored and did something very crude/immature. XD
I inked/painted a picture of something on the wall, and asked him to swim up and down the wall with me, and he has no idea what I just made him do. XD
As the cherry on top, when he said “I don’t think anyone’s Coming”, I bursted out laughing like a maniac! XD