The movie Gettysburg pretty much defined my adolescence. Here is a clip of what was probably my favorite part. The power and raw emotion that Colonel Chamberlain elicits when he screams "bayonets!" is yet to be matched in the cinema. (On a side note, I was fortunate enough to meet Jeff Daniels, the actor who played Chamberlain, several years ago, and I spent about 5 minutes telling him he was my hero. I asked if he would ever want to have a Civil War re-enactment with me and he said he would love to but was really busy and therefore could not - I get that a lot).
Also, I just came across this Gettysburg re-creation, which is one of the funniest things I've seen it at least 2 or 3 years.