This beauty, a mash up of “no use crying over spilled milk” (don’t be unhappy about things that already happened and cannot be changed) and “there are plenty of fish in the sea” (other choices), was spoken by the character Don Draper in the tv show Mad Men (Season 4, episode 7 – “the Suitcase“).  After Peggy talks to her boyfriend on the phone, she tells Don that she thinks she just broke off the relationship.  Don replies with this malaphor.   A big thanks to John Costello for spotting this one.