Why do toothbrushes have colored bristles?
Toothbrush manufacturers are doing everything they can in order to make us buy their products. It is really hard to buy a “plain” toothbrush nowadays. Many models have bristles of different colors and after a few months, they lose their color — which is a sign that it is time to change your toothbrush.
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.