Video: River Plate fans put the mental into El Monumental

Last week, Boca Juniors and arch-rivals River Plate met for the first leg of their Copa Sudamericana tie at La Bombanera, and their fans went suitably crazy.

Well, not to be outdone by their great rivals, River's fans put on a show of their own for their side ahead of the second leg at El Monumental, with fireworks, flares and a hell of a lot of noise. After watching this, every hair on my beard is standing up, and I now look like I've been electrocuted. However it plays out on the pitch, which set of fans wins the battle of the entrances? I can't decide.