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by 3am 5479 days ago
They encourage that prominently in several places, including this message on the actually coupon voucher:

"*Remember: Groupon customers tip on the full amount of the pre-discounted bill (and tip generously). That's why we are the coolest customers out there."

I've got no lost love for GroupOn, but this massive pile on/proof by anecdote thing is not a dignified moment for HN.