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Have your players been arguing over what to buy from a shop for 45 minutes? Starting to get annoyed? Make something happen! Make an pickpocket rob them! Have the shopkeep kick them out for loitering! Maybe a group of Bandits storm in to try and loot the place! The shop next door catches ire! Spice things up! I do this almost every time my players go shopping to prevent them from complaining about how boring the session was just because they spent 20 minutes debating between items!