A teacher walks into class...
and he says, "OK boys, turn in your homework."
The first student says, "I left mine in my locker."
The teacher says, "There's no one in the hallway, so you go get it!"
The second student says, "I left mine in the library."
The teacher says, "Be very quiet, but you go get it quickly!"
The third student says, "I left mine in the girls locker room and I can't go get it, because the volleyball team is changing into their uniforms."
The teacher says, "You stay here, I'll go get it."