Something is in my attic rambling/moving around!?

It sounds like someone is picking things up, then walking, then setting it down. My attic is right above my room, and it's a little freaky. Is it a person, or what? What do I do? I am NOT going up there!
Update: Oh crap! It sounds like its running around! This is freaking scary! My dad thinks its rats or squirrels. I would go in there and tell you guys what it is, but I don't want it to attack me
Update 2: it's been like an hour since i heard it, and there it is again. it sounds like its runnnig and beating on things. or walking down stairs. & i have stairs. eekkk
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