Taps can be turned on in different ways based on their design. Some have knobs, others have a handle, while few others have an extension.

The one shown above had a stick like extension with a red mark on it. Does it mean that hot water flows out? What if this stick is pushed forward? Does it let cold water out? 
Oh wait! How to turn this tap on? 

Ah! user has to play with it for a while to figure this out. Can't user do even this?

Shame on the user!