this actually just ranked as number one on ESPN so it seems like I'm making the trendy pick, but I was there, about 18 rows up from home plate. This entire scene was without a doubt the funniest thing I have ever seen anywhere.
YouTube - Mississippi Braves Manager goes crazy
What makes it even better was that about 3 innings later his pitcher got tossed for using an illegal substance. The pitcher is infuriated and turns from the mound and chucks the ball out into left field. Even more amazing, the ball was still about halfway up the foul pole if not higher when it cleared the fence. That pitcher freaking launched the thing.