I don't know if this has posted before, but look at the frame deflection
http://www.youtube.com/watch?v=6p_UOnptMyc&feature=related
http://www.youtube.com/watch?v=DCo5uX8a1hs&feature=related
http://www.youtube.com/watch?v=6p_UOnptMyc&feature=related
http://www.youtube.com/watch?v=DCo5uX8a1hs&feature=related
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