This error is well known for most people who play the scary maze game. They say when you hit the wall on the thin part of level 3, the screamer pops up. What actually happens is in the half of the thin part had the goal action, just like the red, that means the scary face is the "fourth level", and the thin part is a "shortcut" to level 4, it makes the scare more unexpected. In conclusion, if you hit the wall or not in the thin part, you'll still get brown or soaked pants.
