Okay, so you're on a train, right? And it's heading for five people tied to the tracks. You can pull a lever to switch it to another track, but there's one person tied to *that* one. What do you do? Most people say pull the lever.

Now, imagine you're on a bridge over the tracks. Same train, same five people. But this time, there's a really big guy next to you. If you push him off, he'll stop the train, saving the five. What do you do?

Why does the answer feel so different?