There are spikes at the bottom of the canyon.
In Get in the Van, Tennis Ball, Golf Ball and Rocky falls into the Evil Forest after being thrown away from Puffball by Gelatin. They are chased by Evil Leafy. Meanwhile the FreeSmart Van encounters the cliff from the other side and jumps over it, then crashes into TB, GB and Rocky. Evil Leafy eats all of them.
In No More Snow!, the W.O.A.H. Bunch members (except Pin, who was dead) fell into the canyon. They threw Spongy to the spikes and stood up on his body, and four of them escaped by calling Needle "Needy" and getting slapped out of the canyon. Needle and Spongy were then killed when Yellow Face threw a flamethrower down to ignite them.