They all sit to the sides of park features then one randomly jumps up and does it. It appears to be some kind of waiting line, but they usually wait in front of things, not out of the way. It is almost inviting you to just go, but then one jumps up. What is going on? It's like they are trying to build the confidence to go for it, but it is apparently spontaneous. Why do they sit down in line? They're not waiting overnight for a video game or something.
Halp.