Friend funds are a thing now, where friendship groups pool money to cover socialising costs. But does that not just sound like splitting the bill with extra steps? We get into the real drama: people who itemise exactly what they had, latecomers who dodge the entree split, and the classic T-Rex hands move where someone's arms mysteriously get too short to reach the bill whenever it arrives. Also a genuine disagreement: if you invite people to your birthday dinner, should you pay or should they?