While unpacking the car immediately before a big promo shoot with Kristanna Loken, my Canon 70-200mm f/4 lens tumbled out of my bag onto the asphalt of the parking lot. B+W filter is fine... but the front element of the lens has a big scallop crack in it, and won't focus either manually or AF. The rest of the shoot went fantastic, but I'm still disgusted with myself. Time to drown the sorrows perhaps...