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The noises that come from the upstairs apartment are one of the great mysteries of apartment living. There's a reason though that it sounds like the people upstairs are constantly dropping bowling balls wrapped in chains on the floor -- because they are. If you think that your upstairs neighbors are purposely trying to screw with your head, you're most definitely right. 

Source: aboveaverage

You better just invest in some earplugs or move to the top floor in the building.