A way of rating a "that's what she said" joke on a scale from one through three. Level one being the easiest and three being the hardest. A level one is very easy to make, and doesnt require much thought be put into it. A level two is when someone says something that requires some thought and imagination to make it seem sexual. Level three is just a level two, but in front of a large audience.
Thats a level one on the Riddle Scale if ive ever heard one