What’s made of wood and is zig zag shaped?
Stephen Hawking's coffin.
Zig Zag Shaped Coffin
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Explanation
This is a dark, morbid joke. It plays on the idea of Stephen Hawking's death. The twist is that a wooden, zig zag shaped object is his coffin, given the fact that Hawking was disabled and that his body was not straight. The humor comes from unexpected comparison and a slight gallows humor.