A: I have a stomachache.
B: Is it something you ate?
A: Maybe. I'm not sure.
B: What did you have for breakfast?
A: The usual, cereal with milk and a banana.
B: Maybe the milk was bad.
A: It didn't smell bad.
B: Maybe the banana was bad.
A: No, the banana was delicious.
B: Maybe you just need to go to the bathroom.
A: No, that's not the problem.
B: Maybe it will go away in a little while.