The critter keeper, has a very loud top. Whenever i take the top off, it makes a loud (from what i think the snake hears) thunder noise. I have not done the tin foil, heater tape rig yet (pics on that thread are not up..>!!!).
Its really annoying, but whenver i pull the top off I know it scares the snake, I try to do it slowly but it is always not a natural thing.