A Mexican coffee drink made of very hot espresso coffee mixed with hot milk in a collins glass. The mixing is done right at your table.
In La Parroquia the waiters take pride in pouring the hot, steaming coffee from as high as possible. And they never spill it !

The lechero is a tricky form of drinking coffee: the smoothness of the brew will convince you that you are not having that much caffeine. But you are: by the third glass you will rip off your shirt and start doing single arm lifts of your table, while yelling "ME TARZAN".
Or you will simply dive into a fascinating paleness+tremors+paranoia+cold sweat episode. Either way, watch those lecheros.