A gag?
If this isn't tongue-in-cheek, how do you explain:
- people talking to plants
- singing "Mississippi Moon" to hostile, gun-toting homeowners
- waiting for the guy with the pistol to shoot himself so you can retrieve it and do likewise
- outrunning the wind
- laying down in front of riding lawnmowers
- extolling the virtues of hot dogs
- a zookeeper offering literal finger (and arm) sandwiches to hungry lions.
- MW insisting Mrs. Jones should listen to him because, "I'm a teacher!"
- comical expressions by, well, almost everyone in this film
- school bus with a happy face
- Zooey Deschanel
And many more.
I wonder if MNS actually tried to punk everyone, and face-palmed instead.