Most of the time when this has occurred to me, the original programmer is not around. Regardless, I rewrite the code.
If the programmer is a newbie, I may try to work with them to change their ways.
If not, I don't bother - their bad habits are ingrained, and I've learned by experience that you can't teach a bad dog good tricks. I discuss the issue with my manager. It's best to let managment know that they are a potential problem, and let them deal with it.
Remember: There's always one more bug.
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