A: What's this stain?
B: I don't know.
A: It looks like blood.
B: I think my nose was bleeding.
A: You should wet your shirt immediately.
A: Because that gets the blood out of the shirt.
B: What's a little blood?
A: Your white shirt is ruined.
B: So, I'll just buy another one.
A: You can wear this one around the house.
B: Next time I'll soak it immediately.