As the man removed the lugs from the wheel with the flat he placed them in a tray from his trunk, left there by his wife when she returned from a bridal shower. As the man removed the last lug, he stood up and proclaimed, "There, all five are off." But he accidentally stepped on the edge of the disc and the four lug nuts in the tray were flipped into the roadside canal and lost.
As the man cursed under his breath, he wondered out loud, "How am I gonna get to Selma now with just one lug nut?"
The man sitting on the wall suggested, "Why not take one lug from the other three wheels then secure the spare with the one in your hand and the three borrowed from the other wheels?"
The driver was amazed and knew it would let him drive to where he could get extra lug nuts. "So I don't get it," he offered to the man atop the wall, "That idea is brilliant, so why are you in that Asylum?"
As the man on the wall prepared to jump back down and return to the asylum he explained, "Oh I'm crazy fer shur, but I anin't stupid."
Reminds me of the Dennis the Menace cartoon.
Dad is looking at the spare tire on the axle and the flat in the road.
Dennis is standing there with his slingshot.
“Well gee whiz. I figured you took them off so you didn’t need them no more.”