Something about this is just facinating to me. These are some serious industrial shredders. Couches, hot tubs, even a car are no match.
SSI Shredding Demonstrations (http://www.ssiworld.com/watch/watch-en.htm)

Maybe you'll enjoy this series on YouTube...
YouTube - Will It Blend? - iPod (http://www.youtube.com/watch?v=B8H29jU8Wrs&mode=related&search=)

YouTube - Will It Blend? - Marbles (http://www.youtube.com/watch?v=3OmpnfL5PCw&mode=related&search=)

YouTube - Will It Blend? - Golf Balls (http://www.youtube.com/watch?v=MC8Zvl-8ziA&mode=related&search=)

YouTube - Will It Blend? - Hockey Pucks (http://www.youtube.com/watch?v=zxa_64EOmFI&mode=related&search=)

YouTube - Will It Blend? - Crowbar (http://www.youtube.com/watch?v=ifzdez7FRbk&mode=related&search=)

YouTube - Will It Blend? - Magnets (http://www.youtube.com/watch?v=Ax2BOCoVDJk&mode=related&search=)

YouTube - Will It Blend? Video Camera (http://www.youtube.com/watch?v=fY8MqWBIHvo&mode=related&search=)

these are so fun! i see idiots all over the country putting dumb stuff in their blenders now though.....kind of like the "will it cook in the microwave" experiments we had as kids. lol.