"...Ho, Haha, Guard, Turn, Perry, Dodge, Spin, Ha, Thrust!" - Daffy Duck in "Robin Hood Daffy"

I bought a bookcase yesterday so I could shelve all my spare computer parts and stuff. It was one of those Sauder some-assembly-required type shelves. I've probably assembled over a dozen different types of Sauder furniture items in my life. You'd think I'd be an expert at putting them together by now, using the simple step-by-step instructions.

Drats. I flubbed it. I put Part A where Part C should be. Son of a...

Can somebody tell me what good is a college edumacation if I can't screw 2 pieces of wood together properly???