Worst bug you had?

[Krice]

but I still can't find what's wrong.

The bug is probably elsewhere and corrupting the program's code which then crashes when memory layout changes with optimization. I had those when I was still programming plain C. Now with well structured OOP programming and using STL I have got rid of memory bugs.

[AgingMinotaur]

Funny bug: I added water, and discovered that monsters who take drowning damage turn hostile against the water, trying to attack it, thus repeatedly splashing back in, eventually drowning themselves.

Another kludge added, another problem solved.

Minotaur

[Anvilfolk]

Hahahah, that's pretty funny

Water's attacking me! Take that *gurgle* Oh yeah?!? *gurgle* And that! *gurgle*

[corremn]

Sounds like something you can add to the game, i.e you cast confustion on a mob in the water...