From Monica Dunford's recent post on the US-LHC blogs: a cosmic ray muon read out by the ATLAS muon system and Tile calorimeter in the pit. Reality check, indeed. And a brief meditation on the joys of data, especially poignant in the "LHC generation", which has been living its physics life looking at physics event generators for far too long (spoiler: In my experience they are all wrong, always, to some extent -- even when they're "right" in many respects. But the way they are wrong is almost always more interesting than one expects...)
But let's not forget the bottom line: holy crap, ATLAS is rumbling to life.