That awkward moment -- when dealing with a stranger -- that you realize the person you're communicating with is not all right in the head...
And you suddenly find yourself struggling against the gravitational pull of a conversation in order to extricate yourself from the increasing craziness without drawing too much attention to your sudden change in demeanor.
*Um, yeah. I suddenly remembered I have to... uh... go, uh, put air in my tires. yeah. Bye.
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