[footfootfoot]

I tried to use a half dozen Sacajawea gold dollars at the farmer's market once and the guy didn't know what they were and wasn't sure they were US currency. He was really torn between not wanting to lose the sale, not wanting to be taken advantage of, and not wanting to look like an ignoramus. He reluctantly sold me the bread. A moment later his wife showed up, who knew me and the kids from their play group.

Her husband was visibly relieved that his wife knew me, he showed her the coins and sheepishly admitted that he had never seen them before, and asked her if she had. (still not 100% sure I wasn't a con artist) She rolled her eyes at him.