It's rude to fart with other people in the room.
Colin ate a heavy meal for lunch and his stomach is bothering him.
Colin wants to relieve the pressure in his belly.
Colin raises his hand and excuses himself to go to the bathroom.
Colin farts really hard in the classroom to let out all the gas.
Colin finally is able to relieve himself and feels better.
All of Colin's classmates start to call him names and mock him.