Magikarp is, fins down, the most worthless Pokémon of them all, but that doesn't mean it isn't capable of transforming your upper body into a fine paste. How can this be?

I'll let the deadly Pokémon experts at VSauce3 answer that question. They go into exhaustive detail about how a seemingly harmless Magikarp description element could translate into a pile of dead people at the base of every regulation-sized mountain.