Considering that Elmyra is clearly too young and stupid to be a proper babysitter, his parents are oblivious to him being scared by Elmyra's presence, and she tries to feed him extremely hot milk, it's not hard to see why.
Took a Level in Jerkass: While Michigan has never been a particularly nice or cooperative amphibian, he takes it to extremes where he outright mocks Tyrone, who is having trouble crossing the busy highway.Throw the Dog a Bone: The short ends with Tyrone successfully making it back home to his pond when Elmyra shows more interest in Michigan.Squashed Flat: When Elmyra asks her dad to stop the car so she can save Tyrone, she runs out into the highway and gets flattened by two trucks that pass between her.