I walked into the room and saw something very strange. My daughter had my son's foot pressed against the side of her face.
"Excuse me," I said. "What exactly are you doing?"
"Using the foot phone," my daughter replied, as if that was the most natural thing in the world to do.
I gave her a quizzical look. "Does it work?"
She nodded and tickled my son's foot.
"See?" she said. "It works just fine!"
(Apparently not all phones are for talking on!)