X-ray Vision

Spencer: (while throwing toys into the air) Mom, we need to do a clean-up in here! (Throws more toys.)

Mom: Yes, after lunch we'll clean up. It's so messy in that playroom you can't even see the floor!

Spencer: Oh, then we don't have to do a clean-up.

Mom: Why not?

Spencer: Because I can see the floor.

Mom: Oh, really? How?

Spencer: I have x-ray vision!