If you have not seen the previous two Jackass films or the MTV television series, then disregard this review. This third installment is in 3D (if you can't read). Was it completely necessary? No, but it definitely made it more enjoyable. Jeff Tremaine, who directed the first two films, is back once again. And of course, the same group of guys are also back. They include: Johnny Knoxville, Bam Margera, Steve-O, Chris Pontius, Ryan Dunn, Dave England, Ehren McGhehey, Jason Acuna (Wee Man) and Preston Lacy (who was also credited as the writer). Tremaine, Oscar nominated director Spike Jonze, Phil and April Margera, skateboarding legends Tony Hawk and Mat Hoffman, pro football players Jared Allen, Josh Brown and Erik Ainge all get into the fun. Some of the skits are funnier than others, as usual. Some are completely unnecessary and others are shockingly disgusting. Steve-O is always the one who does the grossest stunts and Knoxville does the most dangerous ones. Although this film isn...