A good friend of mine once confided to me, "All men dream of ponies." That was maybe ten years ago and it seems that such dreams are now out in the open.
In Too Many Pinkie Pies Pinkie Pie (the best pony) is hysterical that she cannot do every fun thing with every fun pony simultaneously, that she is going to miss something is a torment to her. This is the way I feel about death, not that that's relevant.. anyway she hears of a magic pond in a magic cave where if you do a magic chant while looking into it another one of you emerges from the pond and you can now do double the things! But this backfires because soon her doppelganger is also chanting into the pond, and multiplication takes over and suddenly there are too many Pinkie Pies.
Pinkie Pie is incredibly annoying as a single pony so it's a very severe situation to have dozens of them.
I do think though that we should have had another season of Voyager with both Captain Janeway and Admiral Janeway on the same ship, snapping at each other and then bonding and making everything unbelievably awesome.