Some things just make sense. Here’s one;
Back in the day, when people used double-edged razors, medicine cabinets had a slot in the back for disposal of these blades. The blades would just fall into the space between the two walls, there was no basket or anything to catch them. Theory was that the cavity would never fill anyway, and the blades were out of the way and safely out of reach ot the kiddies. They were right.
What’s your favorite example?
Peace,
mangeorge
My brother relates the story that a couple of months after he’d bought his townhouse, he had to change a lightbulb in his upstairs bedroom, one that was way up high. He didn’t have any lightbulbs in the downstairs pantry, so he had to go to the grocery store and buy some.
After he’d changed the light, he muttered to himself that what he needed to do was store the ladder and some extra lightbulbs in the closet, so it would be easier to get to.
He stopped, opened the closet door and found that he’d done exactly that two months previously.
Looks like some still have that slot! 
Until some poor sucker decides to remodel his bathroom and gets a ton of blades pouring out onto his floor. 
This was used as the basis of a commercial for an electric shaver back in the 1960s/70s. They showed a hand slipping razor after razor into that slot, until (file footage) the building collapses. You could keep it from happening by muying a (whatever) brand electric shaver, which uses no blades!
This is a very old joke, but I like it:
A man is driving down a road that passes a mental hospital. He hears a loud noise, and his car lurches. He realizes that he’s had a blowout. He pulls over to the side of the road, and sure enough, he has a flat tire.
He gets the spare out of the trunk and begins to change the tire. He jacks up the car, removes the wheel with the flat tire, and to prevent the lug nuts from getting lost, he carefully places them in the hubcap.
So far, so good. But, as he is installing the spare, he bumps his foot against the hubcap, which sends the lug nuts rolling. Oh, no: all four of the lug nuts fall through the grate of a storm sewer. The man curses out loud, and hollers “What am I gonna do now?”
A soft voice comes from the other side of a nearby fence. The voice says “You can take one lug nut off each of your other 3 wheels, and put them on the spare. That will give you three on each wheel, which will hold your wheels on well enough for you to get to the service station down the road.”
The driver walks over to the fence, sees the sign that says “State Mental Hospital,” and says to the guy on the other side of the fence: “Hey, that’s very smart thinking. So how come you’re in a place like this?” The mental patient smiles, shrugs, and says “Sir, I’m in here 'cuz I’m crazy, not 'cuz I’m stupid.”
It happens. Ask any remodeler. Er, carpenter who does remodel work.
My ex-fil told me that joke, word for word I think, over 30 years ago. It’s a good one.
BTW; he’s from Oklahoma. 
I don’t know if this is what you’re looking for or not:
I have oddly-shaped feet. One time I was talking to my mom and I said that if I were a multimillionaire I’d have surgery on my feet so that they fit into normal shoes.
Mom said, “If you’re that rich, why don’t you just get custom-made shoes?”
That’s what I call common sense.
I saw a bathroom in a European hostel which had two doors feeding to both of the units it serviced. When I entered the bathroom, I noticed a full-length wooden bench that folded out of the wall in such a way that, when in the extended position, it’s edges lay perfectly flush against each door and thus served to lock each bathroom door.
Yep, perfectly.
…“Ohhhhhhhh, fuuuuuuddddddggggge.”
[sub]Sorry. You just can’t escape the reference with a setup like that.[/sub]
Thomas Jefferson was deeply involved in the creation of the University of Virginia.
The story is told that when it came time to lay out the walkways on the beautiful campus, various layouts were proposed for his approval. Jefferson rejected them, saying that the best approach was to plant grass everywhere and wait a couple of years - after that time, the worn grass would show where paved walkways should be built.
I still give my mother-in-law grief for this one: one fine day, the door handle on her car broke. That is, the inside handle on the driver’s door didn’t work. So, she called her daughter (my wife), and moaned about how she could get in the car easily enough, because the outside handle still worked, but to get out, she had to clamber over the passenger seat and out the passenger door.
I asked, “Does the window work?” “Yes.” “Why didn’t she roll down the driver’s side window, reach out, and open the door with the outside handle?” “…”
The really funny part is, I believe at one point she was considering actually climbing out the window to get out of the car, yet it never occurred to her to just use the outside handle from the inside.