I would but my house is always full of people and I don't want to impress them with my marvelous singing ability. They already think I'm so great, don't want to over do it and cause them to develop a complex.
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"Moris should be here soon to rub it in my face..." -Pizza
Also, the acoustics are awful in the shower; it's all echo-ey in there. Plus, I don't like to sing at all, let alone when I'm trying to accomplish a more important task like bathing.
I sing a little, but not really anymore than I would around the house. I don't really sing loud enough for people to hear me anyways. I've been told that singing in the bathroom is supposed to be good. Good acoustics or some crap.