As someone who has struggle with his weight in the past, I’ve learned early on that when your friends ask you to climb on top of something, it’s never a good idea. This guy unfortunately did not learn that lesson, and that it’s especially true when they want you to climb on top of a live animal…
This is why they never had Shrek trying to ride Donkey in the movies. Also, it’s probably why Donkey was the one who rode on Skrek’s back…