This was taken with a 20mm lens at my old work (don't you love my office?) The colored bit around the lightswitch is what was covered by the 300mm lens. Yes, that's a wookie.

Both these pictures were scanned at the same resolution, and both are the full frame. I put the "Escape from L.A." postcard on the lightswitch to see if anyone would notice, and it sat there for 5 months before anyone said anything.