[chabad360]

You ever seen those bugs, where adding a printf makes the bug disappear?

[Enginerrrd]

Heh. Sounds like race conditions. That or your code is possessed, which I've had happen too.

My personal favorite is programs that seem non-deterministic. Different errors/results for different executions.

[bryanlarsen]

Have you ever seen those bugs where attaching a debugger made the bug disappear?