The first student raises his hand and says, “The sky is definitely blue.”
The teacher says, “Well, that isn’t entirely correct, because sometimes it’s gray and cloudy.”
Another student says, “Grass is definitely green.” The teacher again replies, “If grass doesn’t get enough water, it turns brown, so that isn’t really correct either.”
Another student raises his hand and asks the teacher, “Do farts have lumps?” The teacher looks at him and says, “No, but that isn’t really question you want to ask in class discussion.”
So the student replies, “Then I’ve definitely shit in my pants.”