Heh, reminds me of a story...
I was in my last year of school, and it was early December. Snow was already on the ground, and I was in a Weight Trainiong class as an elective. I didn't want to bother changing back into my pants, so I just wore my shorts home. So, there I was, in shorts and a T-shirt, with a light jacket that was open, and I look over to see some exchange students looking at me. They were decked out in these huge, thick parkas, and there I was, shorts and a jacket.
And I was plenty warm. 
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FOUR
Four is the only number which is itself has the same number of letters as it itself is.