For his project Velocipedia, artist/designer Gianluca Gimini asked friends and strangers to draw a men's bicycle from memory. Then he digitally mocked up the designs.
Soon I found out that when confronted with this odd request most people have a very hard time remembering exactly how a bike is made. Some did get close, some actually nailed it perfectly, but most ended up drawing something that was pretty far off from a regular men's bicycle. Little I knew this is actually a test that psychologists use to demonstrate how our brain sometimes tricks us into thinking we know something even though we don't.