Why do we use plungers in the wrong way?
Almost everyone has this rubber thing at home — who knows when you might need it. Usually, people keep them in toilets or bathrooms. But it turns out that different plungers can be used for different things. The one we know is only good for clearing out bathrooms and sinks. But if you want to unclog a toilet, you need a different one like in the picture on the right, above.
The airplane seat’s ears don’t work as intended.
Beer Bottles designed to be held in one hand, and drunk out of directly, have their shape constrained by human anatomy. The lower part of the bottle needs to have a diameter that can be grasped securely. The bottle mouth needs to fit into the human mouth, and have a shape that won't produce leakage when you drink from it.
When was the last time anyone got a French fry container from McDonald's like that?
They stopped using those in the late 90's.