It's gross to dig through the trash.
Carl arrives at the school cafeteria for lunch when he realizes that he forgot his lunch bag on the school bus.
Carl wants something to eat for lunch.
Carl borrows a few dollars from a friend and uses it to buy a sandwich to eat.
Carl digs through a trash can and finds a couple half eaten pizza slices which he proceeds to eat for lunch.
Carl is happy to get some food and enjoys eating the sandwich.
Carl later feels a bit sick and regrets eating food from the trash.