I believe, if you put that as a search on the internet, you'd get plenty of porn. 
Mostly the problem is there if the cavity is either filled with something compressable (bowel) or is in close connection to the outside (ear). Technically opening one's mouth when the shockwave hits might help with the ears, but the bowel - well, just try to keep out of the way of the blast.
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"Listen to me, nugget, and listen good. Don't go poppin' your head out like that, unless you want it shot off. And if you do get it shot off, make sure you're dead, because if you ain't, guess who's gotta drag your sorry ass off the field? Were short on everything, so the only painkiller I have comes in 9mm doses. Now get the hell out of my foxhole!" - an unknown medic somewhere, 2013.
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