What type of Saw Traps could you think of that haven't been used in the films? What are the rules and how would you escape?

Here's one of my ideas:

Name: The Tableweight Trap

What it is: A man is strapped onto a table with a giant weight hanging above his face, behind a soundproof wall is his wife, there are a ton of keys hanging from the ceiling, she had to pick the right key to release him within the time limit, but every time a wrong key is picked, the weight raises 3 inches, if time runs out, the weight falls and crushes the man's head.

How To Escape: Just hope she picks the right key

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