Twenty penguins together are always evil. Penguins are seen in groups a lot, sure, but did you know that any time there are exactly twenty penguins in a group they're plotting evil things? Evil things like global warming. And how to eat all the fish in the world so humans can't have any.
The evil penguins can't let you tell the other human's what you've seen, so they murder you and hide your body in a haystack (へい). Your family will never know what happened to you. The penguins will get away with their evil plans.