This one is also from a friend visiting Mexico:
This tap is a personal favourite of mine!! It was in a restaurant in
Manzanillo and perhaps should have come with instructions!! There is a
small lever coming out of the tap (where the water comes out [aerator]) and to turn
the tap on you had to push this lever. You also had to keep it pushed to
keep the water flowing which meant you needed some pretty fancy finger
gymnastics to be able to wash your hands.
Well … I have no comments :=). The designer of this tap mush have had imagination.