Oh, how many times have I wished for a pointer to just null itself.
This one, depending upon how it gets implemented, should be a really good one.

Imagine if there was a hack so bad that it caused everyone to become unable to develop in C and C++.

Well, there is one that will imply you can only develop using anything that you have bootstrapped yourself, using hardware that you have designed and manufactured yourself, using tools that you have designed and manufactured yourself, using tools that you have designed and manufactured yourself …

… with your own bare hands.