I got a few hisser but its always a bluff. The only time any of mine ball up is on the weekends when I go in the snake room. We have wooden floors so they feel the vibrations very easily and if you peek in their hides youll seem em tighten up. Other than that I work during the week and theyre usually awake when I'm home. They all get a good portion of handling so theyre rather comfortable being held.