Originally Posted by
tFUnK
take off the bolts and try riding gently around the block. maybe up some slight inclines or down some small curbs. can't guarantee that you won't damage something, though.
I'd ride to the LBS instead of around the block, make sure the bolts aren't totally loose, so the crank arms stay attached. Once you get to the LBS, pull off your cranks and toss them in the trash, purchase a replacement set and put them on. This way you will save the cost of a crank-puller ($14) or the cost of labor ($5) if you were to have the LBS pull them off.