There have been a few, one guy broke in and had a conversation with the Queen before being captured. There was the Fathers for Justice guy and the Fan Man landed on the roof (the same nutter once landed in the ring during a Heavyweight title fight). So yeah, you're right. Aha thats awesome, "had a conversation with the queen". As for the Greenpeace people, I don't really care, but am a bit surprised they managed to get up there in the first place.