Chicago Bulls deal
Groupon were pitching the idea to the Chicago Bulls. Sales were in, but marketing were not and the deal has been eventually turned down. However, it turned out the Bulls have a group sales department where if you brought 25 or more people to the game, you got a 50% discount on tickets.
Tickets for Chicago Bulls game were featured on Groupon anyway, and they sold over 26 of them, which they had to distribute manually in the group of buyers. Chicago Bulls marketing weren’t happy with that, especially for an unauthorized use of their logo. The logo had been shortly gone from Groupon, but they leveraged the Bulls deal to land other brands in Chicago, like Whole Foods.