A: I want to take off my shirt.
B: Why do you want to do that?
A: My shoulders hurt from yesterday.
B: What happened yesterday?
A: I went to the beach.
B: Are you sore from swimming?
A: No, I didn't go swimming.
B: Then what happened?
A: I fell asleep without a shirt on.
B: Then you must have bad sunburn!
A: I do. My shirt makes it worse.
B: It's too bad we're in school.