Little Johnny farts in the classroom

Little Johnny farts in the classroom, causing his teacher to get really upset and throw him out. Sitting outside the class, he can’t stop laughing. The principal walks by and asks, “Little Johnny, why are you sitting outside your class laughing?”
“I farted in class and the teacher threw me out,” Johnny replies.
The principal asks again, “Well then, why are you laughing?”
“Because those idiots are sitting in the class smelling my fart while I’m outside in the fresh air,” Johnny says with a grin.