Final testing stages

So, I don't know how many developers are out there, but have you ever had one of those experiences where you write a bunch of code, it all works really well when you're doing your initial testing, but then when you go through and do a complete system walk-through, you find a bunch of crap that you didn't know about, but there was no reasonable way you could have missed it? Well, my name is Thomas, and I very unreasonable missed a lot of stuff.

Most of it was minor, and quick fixes, but some of it I'm still working on. But good lord! I guess in a complex system of n parts there's n-squared places things can go wrong... I think I found all of them.

And to those test-oriented developers out there: bite me. ;)