Grandpa: You keep saying that I must consider myself to be especially smart. I sure never said that. I dunno where ytou get that, but if you keep saying it pretty soon maybe I will beleive it.

Gosh, I don't think you are stupid, just cuz we disagree on some political issues. I think folks can be pretty dang bright and still disagree with me. Do you suppose anyone who disagrees with you could possibly be nearly as bright as you?
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No huevos no pollo.