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Still, customer after customer strode up to a stainless steel wall lined with beer taps to insert a card, touch a screen and pour a glass of self-serve beer.

At Walters, the beer wall cuts customers off after they pour 32 ounces — the equivalent of 2 pints.

The beer wall set him back about $100,000, but he believes it will eventually pay for itself.

According to Goodman and others in the industry, self-serve taps are exploding in popularity.

And when it comes to cocktails, automated self-serve taps pour exactly the same drink every time.