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The native is distressed. He has spent all of a single week raising the credits for a single scoop of ice cream, and he has been looking forward for the sweet release of an orgasmic sugar rush for quite some time. Your strange jawbreakers do look tantalizingly sweet however, and he decides it may be a fair trade.
He attempts to bite the strange shiny rock. It cracks his teeth, causing him intense pain. You attempt to hand back the ice cream in exchange for your rupees, but he does not want someone else's used goods. He swats the cone out of your hand.
The bouncer's intelligence is insulted. Of course a security enforcer would know the art of exchange. He works at a freaking bar for crying out loud!
It seems you are making plenty of new friends today. What will you do?