Hopkinsville Goblins

-- Kelly, Kentucky, USA --
-- August 21, 1955 --

Silent, silvery creatures that were invulnerable to bullets (or had really fast reflexes). Despite being shot at, the creatures continuously peered through windows at their would-be killers, seemingly taunting them.
Notably, the 'goblins' were first sighted with their hands up as if surrendering, and didn't appear at any time to be hostile.