Setting: After staining the deck of Sierra Lodge, a bunch of sisters who were peer groups with sister M were pretty tired and ready to wash up and go home.
Foreman: Great job on the staining. You can wash your hands, and make sure that you wash the rags thoroughly, because they can spontaneously combust.
[2 minutes later]
M: Umm.. we're having problems with the water... We turn it on, but water's not coming out.
Foreman: Uh.. that's the propane gas valve.