He was clearly thrown by the impact. He didn't intentionally vault over the truck. If he is a gymnast, that training may have helped him to manage his fall in a way that reduced injury. The story of his "vaulting" is probably retroactively applied in the same way that a cat will give you an "I meant to do that" look.
"Possum" only has one "o". If you use two "o"s you ain't from around here. Plus possums are vermin, not pets. Also, I'm looking forward to the next installment. I'm hoping it's a fricassee, but breaded and deep fried would be alright, too.
It's the lumbar vertebrae from the lesser giant tree hamster of Pago Pago. Thankfully, they went extinct in 1953. Notoriously prone to stowing away, they wreaked havoc aboard wooden sailing vessels by gnawing straight through the hull below the waterline. Great numbers of them were lost at sea, until eventually their numbers could not be sustained due to their relatively long gestation. Since their extinction, boat captains have enjoyed the reprieve from losing their craft.
...Now where'd that pot-passer get to?
@AlisonCJ and @MattG: http://en.wikipedia.org/wiki/Ough_(orthography)
Occam's Razor T-Shirt
Stickman Action Figure
Thanks