Not sure if kidding :P
Many companies do these prefab soundproof "boxes", this is one example:
http://www.wired.com/gadgetlab/2008/11/sound-proof-roo/
Some are made entirely with triple layer glass panes, my friend has one of them in his studio for drum recording, they are tailor-made, so you give them the dimensions, they ship you the panes with the frames, and you mount it with a couple friends
They're pretty awesome, when playing drums, the sound levels outside are as low as, say, a very lightly played acoustic guitar
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