Check out this thread on the PSA boards. To make a long story short, apparently the guy didn't like the "lowball" offers that he received on his cards ('68 Mantle, '70 Munson rookie, etc) on the B/S/T board, so he posted a Youtube video of himself shredding them. The funny thing is that he must have use a photocopy of the cards, because you can see a white outline around the border on the back of the cards. It's worth a few minutes of your time if you're bored and want a good laugh.
http://forums.collectors.com/message...hreadid=793221
Here's a link to his thread with the cards for sale.
http://forums.collectors.com/message...hreadid=793142