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I really need better ideas.
Either Amy is colorblind (are hedgehogs supposed to be?), or she is not very familiar with Sonic's appearance. XD Here is both scenes where she mistakenly hugged Shadow AND Silver! And poor Sonic seems annoyed, el-oh-el!
Shadow: What the--
Silver: A hug... from a girl!
I dunno, I kinda think Silver is somewhat geeky, though not in a bad way.