peanut butter and raisins

I just had the opportunity to make Josh a peanut butter and raisin sandwich.
If I had offered someone one they probably would have given me a strange look, been disgusted, or turned me down... but not Josh. Not only was josh excited to receive his sandwich, but when he noticed that there were raisins inside he laughed, danced and shouted!
What gives us our sense of disgust?
I wish I were more like a toddler who was so care free and adventurous.

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