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I wouldn't see why it would be harmful...

However, be careful, because if you are playing with a $3500 machine like myself, there are always cases of "I accidentally dropped my laptop on the ground trying to read a pdf sideways."

The case, hardware, and screen shouldn't really be too much to worry about, but don't go throwing your mac around =/ I'm wondering if your mbp's built in "shock" sensor would trigger though, something I have yet to find out.
 
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