Singing along with my Ipod..

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I have this habit of listening to my Ipod during work, during travel or walking home. I usually get this urge to sing with my ipod, so you'll often see me walking alone, or in a bus alone, with my lips moving ( singing, that is ).. I often think how I look like to other people, if they find me weird, or would they think that I was getting crazy talking to myself. LOL. If you see someone with earphones plugged on their ears, and their lips muttering something that you can't really hear, would you think they look weird? or it's nothing to you?