WinFight

This is for all the would-be gunslingers who’d rather be playing Law of the
West than doing a mail merge. Run the program, select “timed fight”, and then
go about your business… periodically, a little black-hat cowboy will
unexpectedly appear somewhere random on your desktop, intone “Draw!”, and
reach for his six-shooter. Can you find him and click on him before he plugs
you? If not, perhaps you’d better stick to the mail merge, though you can hone
your skills using the “Fight now!” mode to take away the unpredictable timing
element.

WinFight