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My coworker took down our site briefly by removing an html comment that said "don't remove this comment".

Load bearing print statement!

I've had a few of those, I think they're usually a symptom of stack corruption.

Or a concurrency/timing issue, where the delay of the I/O changes things just enough to make them work on your setup.

Back in the day the QA department would veto a release candidate of our firewall product due to performance degradation if a network cable in the testing equipment was bent too much during validation runs. Rearrange the cable and next test run would pass.

Timing matters.