Finders Keepers

According to the Oxford Dictionary of Phrase and Fable, the saying "Finders keepers (losers weepers)" dates as far back as the early 19th century, recorded as, "No halfers-findee keepee, lossee seekee."

Almost 150 years later, Elvis Presley put it to music in 1963 when he sang "Finders keepers, losers weepers. The loser has to pay the score."