What's your biggest, best, funniest most bone-headed move related to your car?

Aight, so here's something BONEHEADED and just happened about an HOUR ago, so you know I am still in practice! Doing some work on my Toro zero turn......GAWD I hate the thing. Anyway, replacing the carburetor.....AGAIN due to ethanol. So I'm done with ethanol in everything now. Anyway, the carburetor has like a plastic 90 degree manifold "elbow" that bolts to the engine. Held onto the engine with two bolts. The carburetor is held onto the elbow with two long "stud" bolts. So, going back together, I get it all lined up wondering why it won't go back together. I mean really, a chimp could literally do this. So, all of a sudden it hit me that I have the carburetor mounted BACKWARDS on the manifold elbow. I'm tellin you boys, I'm still full of um.