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I'd grab stuff with my tail and throw it at people lol. When they look, I'd hide the tail and they'd be super confused. Other than that there's not much use for a tail is there {XD}
You're all assuming our tails would be prehensile. For most monkeys they're not. =P
That said I don't think I'd like it very much, prehensile or otherwise. It would be a challenge to sit down, and I wouldn't be able to wear half of my clothes lol.
I'd either wait for a full moon to transform into a giant monkey that can hadouken out from my mouth, or watch a vapor trail while I'm brought into conflict between my brain and my tail.
I would probably try to grab something with it, but want to remove it as soon as possible. It wouldnt be very comfortable to sit down with and kinda weird.