Argus

Argus, the Goddess Hera's watchman, was charged with guarding one of Zeus's girlfriends, Io, who was in the form of a white heifer and chained to an olive tree.
Zeus sends Hermes to sing Argus to sleep. After all of Argus' eyes close, Hermes  bashes him in the head with a rock, and takes that hot cow back to his boss.
Hera recycles all of those peepers by putting them on the tail of the peacock.
Ta daa!