From Wikipedia:
The correct choice of functions and priorities greatly influenced the end result. For example, the following joke of the 1980s is known:
If we consider that the purpose of the car is to ride on the roads, then its main part is the engine. Then the development of the car starts with the engine, and the passengers are placed in the remaining place. If we consider that the purpose of the car is to transport passengers, then the development of the car starts with the cabin, and in the remaining place we place the engine. As a result, in the first case we get the Zaporozhets ZAZ-965 and in the second - the Volkswagen Zhuk.