I a little side adventure for some of my group to give them a little more xp. They ended up getting attacked by some thieves and one character, who had just gotten a new Bag of Tricks and just couldn't wait to try it out, was able to summon a rhino with his Bag of Tricks on the first try. His Rhino then proceeded to kill the thieves and destroy the building they were in. The owner of said building was furious and refused to pay them any reward for stopping the thieves so they threaten him with the rhino until he coughed up the cash.
And when I ran a game of We Be Goblins at Gen Con 2011 there was a 9 or 10 year old boy playing with his dad. I think he played the perfect goblin. During the goblin feast and the dares he was the one who was able to ride Squealy Nord, and because of this he thought he could ride anything and everything.
Giant spider "I want to ride it!"
Dog "I want to ride it!"
Giant frog "I want to ride it!"
Horse "I want to ride it!"
"What kind of goblin are you?"
"One that rides on things."