Pendulum thrill me when they get played in clubs, I went to see their DJ set a couple of years ago and it was insane! Everyone had their shirt off, was soaked in everyone else's sweat, glow sticks, dancing until you felt you were gonna collapse, and just the best atmosphere. Slam and Blood Sugar are impossible not to dance to I find.
I don't think I feel this through bias though, but The Fountain is definitely my favourite Pendulum song so far, it just has more depth and feeling than any of the others. It's my song of 2010 for sure, I've been listening to it loads since it was released.