#1 The Ground Pound
Ending this list on a lighter note is one of the more inexplicable injuries suffered by the Viper. During a match at WWE's Over the Limit pay-per-view, Orton faced Edge in a match that had been long awaited.
At one point, Edge was down on the ground, and in his signature style, Orton was setting up for the RKO by pounding the ground. While hitting the ground, it was evident that something went wrong very fast.
Orton had suffered a shoulder dislocation, as his shoulder had blown out from him hitting the mat too hard. There had been rumours of an injury previously, and he exacerbated them by pounding the mat at the pay-per-view, which was the last straw for his injured shoulder.
This was one of the most hilarious yet obviously painful moments, as while no injury is funny, it was weird to think that the Viper had dislocated his own shoulder because he hit the mat too hard.