I understand why pitch invasions are generally frowned upon these days, as there have been numerous incidents of players and officials being assaulted, but it's very hard to bridle the joy of ten's of thousands in such circumstances, especially when something like last night occurs and when the fans have had nothing to shout about for so long.
Personally, if I had been there I would have stayed in my seat though, but that's because I have trouble walking at pace thesedays, never mind running. I had to make do with a little jog to the fridge for a beer.