Jolly good people, you're a smart lot. The last picture was indeed the hands on a clock! Time for a new one, let's ramp up the difficulty a little
A fired bullet casing (i would liked to have said a a herring picking his nose but ill be serious now)
Bottom of a cartridge.
BUllet casing. But Brewster beat me to it.
A cup of coffee, as photographed from a satellite.