The production bug conundrum:
The new release that's going to fix the problem isn't ready yet, but hotfixing it means merge-hell for the new release.

Nothing good ever gets committed before 12pm.

Had to look into some old code today and had the "Is this my code?! This can't be my code!? No one else worked on this code, so it must be mine... But, but, it's so... good! And clean! And logical! And well documented! This can't be mine... Can it!? Hey! It works!" moment.