Wilcox's caddie Middlemo has to buy the drinks?

Wilcox's caddie Middlemo has to buy the drinks?

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As is golf tradition, when someone gets a hole-in-one, they have to pick up the bar tab. So why, after caddie Mick Middlemo's player Will Wilcox made an ace, does the looper have to pick up a bar bill at home?