A scooter sits at the entrance where people enter. You jump on and are flung inside! Because a lot of other people did the same thing, it's really crowded in here.
Whoever came up with the scooter entrance idea, that made your favorite store so crowded? Only a 子 (こ) could come up with something like this. They don't really think about the dangers and legal implications of using a scooter to launch people into a crowded space.