I forget the exact details, but we had a bug that prevented logging in to the app for a large subset of users.

The engineer that caused the bug ended up staying late and fixing it. He was treated like an absolute hero by management, even though it was his fault in the first place. (Don't worry, we all fully understood it wasn't just his fault. The whole system failed and he wouldn't have been harshly judged for the problem.)

From then on we joked about adding bugs on purpose so that we could all get similar treatment.