Steven Wright told a similar joke: “I used to work in a pet store. We had three snakes. One day, business was slow, so I braided them and tried to convince people it was a three-headed snake. ‘Oh, yes, it’s very rare. It’s from Connecticut.’”
Another method of snake movement was not mentioned, unless that was what was described as “concertina movement.” If so, it was not described well.
Each of the large belly scales (scutes) matches to a pair of ribs. The muscles attached to the ribs allow the snake to move the scutes in a wave fashion, such that the snake moves forward without lateral undulations.