Snakes

Jonathan chewed a long, skinny apple slice down to the peel today.
Then he walked around the house, shaking the stringy remnants in the air and saying "hssssss."
A few hours later, I found Matthew slithering along the hardwood in the dining room, dragging himself by his hands.
"Hssssss," he said over and over again.
Either they have simultaneously become interested in snakes or they are trying to tell me we have snakes in the house.
Yikes!