I took this at spring training before this season. I was down with a group of friends (including another forum member) and we were sitting above the Yankees bullpen.
Rivera warming up by
thetejon, on Flickr
The security at the Yankees spring training park is awful - they push people around for no real reason, and it's generally an unpleasant place to spend time. However, a crowd started gathering around the bullpen, and the guards were taking their time moving people along. A guy who was with us went down to investigate, and suddenly started waving urgently for me to come down (I had the best camera). I ran down, and there's Rivera warming up. This is my favorite of the pictures I took.
I'm an Orioles fan, and hate the Yankees as much as any self-respecting fan of another AL East team should, but I'll make an exception in this case.