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The Margaritaville stages of debugging:

1. It's nobody's fault

2. It could be my fault

3. It's my own damn fault

I was merely going to append to OP's list:

7. Who wrote this crap?

8. Oh, I wrote this crap...

I call this the "Kaiser Soze" bug. You spend hours trying to figure out what's causing a bug, only to realize you're the one who caused it.