Xenocide
They have the power to manifest oars out of thin air. Even though they're fish and thus will never have a use for them.

Wait, maybe oars are like crutches to them. Disabled sea ponies get free health care!

Kid Fenris
Applejack actually drowned here. The sea ponies and every My Little Pony storyline that follows this are hallucinations hatched in the last few seconds of a cartoon horse's life.

Binro the Heretic
My baby sister had one. I think they may have used actual lead as a weight in the tail to keep them upright in the water.

I would see the hideous little thing jammed behind the washcloth bar. The plastic around the weight became darkly blotched over the course of time.

Rodents of Unusual Size
My Little Poisoning.

Jane Error
I had a couple that were hand-me-downs. I think their weights were missing because they would just float limply on their sides.

Their hair would never completely dry out--combine that with the fact that they retained a lot of water and you've got some extra-moldy sea ponies pretty quickly.

MrBuddy
Darn it! Why does someone always beat me to the comment I was going to make!

Pope Caius
I did the same thing when I first came across this video.

Nikon
I hope they didn't suffer.

dead_cat
They died with that song in their ears, what do you think?