I made a joke in another idea thread about how if I accidentally feed 532 tomatoes to a piggy, that I at least want to see the piggy explode, but the more I think about it, the more I think it's a decent idea.
Imagine this: You want to turn your tomatoes into tomato seeds, but you don't want to sit there and hand feed the piggy 3 tomatoes at a time for the next 15 minutes. (This interaction is very grindy and boring, believe me.) Instead, you just feed a ton of tomatoes to your piggy. After a second, the piggy goes poof but you're left with all of the seeds, ready to get picked up.
I know it sounds mean, but the butterflies poof when they get used up, so why not piggies? It would also help the auction market for piggies and create a way for piggies to exit the world. (Right now there seems to be a glut of piggies in the world since the change restricting selling to vendors and donating to shrines.)