Corn Snake's Minor Meltdown

[Mayday]

Hi! My son has a corn snake and he set the snake down on a freshly laundered sheet this morning on my bed. The snake is mellow, but for some reason BOLTED off the bed, onto the floor and was moving pretty quickly before my wife grabbed him.
Our dog was on the bed but was not paying any attention to the snake. They usually get along fine.
My son rarely brings the snake into our bedroom, and if he does, is usually holding the snake.
He is quite worried about this. Anyone else have a similar experience? I'm guessing it's just an animal acting like an animal but he is concerned.
Thank you.