Mr. Herkabe: What are you doing?
Hal: Mopping. In five minutes, I will have my two hours, and that will discharge my obligation to the volunteer program.
Mr. Herkabe: Oh, no, it does not, because you have been expelled.
Hal: All I know is I've been mopping! And this floor looks pretty darn clean to me.
Mr. Herkabe: But that was unauthorized mopping.
Hal: It is spotless, and maybe we should just see whether the principal thinks it's a job well done.
Mr. Herkabe: It's not even clean. [flicks soil onto the floor]
Hal: Don't you dare!