I think this one is pretty straight forward. You describe yourself as an object, and other's must guess what you are!
[b][u]Example:[/u][/b]
I have two bright eyes, and my teeth are always showing. I can be quite fast, but only if you feed me. I come in all shapes, sizes, and colors. What am i?
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I have 2 heads, 5 arms and 4 legs. What am I? (Answer in spoiler) [spoiler]The finish line at the Boston Marathon [/spoiler]