Cordless Keyboard

DM: My keyboard has stopped working
Me: Have you checked the batteries?
DM: Which batteries?
Me: The one you put in when we connected it the first time.
DM: Does in work on batteries?
Me: Yes, same as the old one.
DM: But this one is cordless
Me: And it needs batteries, how do you think it gets its power?
DM: Through the air somehow, I don’t know. The computer sends it. It’s cordless.
Me: It runs on batteries, change them and it starts to work again.

DM a little later: I can’t find the batteries…
Me: Have you looked underneath?
DM: Underneath the computer? Not on the back?
Me: Underneath the keyboard!!!
DM: But it’s cordless