I've been getting ready for my oldest daughter to come home from college and one of the things I told her I'd do is replace the door to her room. So we went out, got a new door and all new hardware and I put it on... and it didn't fit. For some reason, the top corner wouldn't close all the way. So I've been screwing with it for days now, taking out hinges, trying to figure out where it isn't fitting, going around the door with a feeler gauge trying to figure out where it's binding.

And stupid me, at the very top of the door, there's this tiny nail, painted white so it blends in, sticking out. The door was hitting the nail this whole time. Once I grabbed a nail set and pounded it back in, everything worked perfectly.

Geez, I feel stupid. Always check for the stupid things before you waste time fixing all of the things that are just fine.