Here is a video by DigitalRev showing how rugged the Basic DSLR are. I though when Kai was walking on them they would died right away. But actually the Canon screen was still working and in the end the Canon was not really that much destroyed compared to the Nikon.
However still advice not to do this with your DSLR. However they are pretty rugged as seen in the vid, but still its better to be safe than sorry. Especially with the lenses.