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A drunkard's nightmare where you fill a huge glass with beer and pass it around while yelling the macho mug song like you're trying to wake up a dead man. You keep singing until the glass is empty and someone is probably dead.
My cousin tried to do the macho mug at my aunt's wedding and ended up puking on the cake.
At the bar, we did the macho mug and I had to drink so much I couldn't walk straight.
My friend's dog joined the macho mug and drank the whole thing and then died.