Tickled

Last night, Night spent the night with his grandparents in the hotel (they are visiting for Christmas). Josh's dad told Night, "Your Grandma gets tickled when I brush my teeth."
"Why?"
"Because when I brush them, they are in my hands!" (he wears dentures)
"Can you do that for me?"
Thinking he meant brush his teeth, he says sure and starts to brush his teeth.
"No!" Night protests.
"Oh. I thought you wanted me to brush your teeth."
"I wanted you to TICKLE me with your teeth."