I spent a lunchtime shooting with an amazing piece of glass. My favorite coworker brought a Canon 85mm f1.2 lens with her 5D mark II camera attached to it, and of course, used this occasion to show off. :)
This is lens is really nice. She let me borrow it (did I mention she is really nice?), and I went to the park chasing anything that didn't move fast enough to escape from it.