We play Nightfall Loot Bets every week, where we bet on each others end screen loot and, if you bet right, that person owes you a beer.
It's pretty much the only reason we still run the nightfall every week... (even with trickle and exposure)
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Sounds like a good idea. It shouldn't be too hard to win the bet either, there's only 3 rewards to choose from. Ghost shell, strange coins and 3oC.