Mathematics is a place where you can do things which you can't do in the real world.

I'm interested in the real world.

You don't get second chances in the real world.

There are the things that are out in the open, and there are the things that are hidden. The real world has more to do with what is hidden.

Being offended is part of being in the real world.

Racism is unacceptable in the real world, and it's unacceptable online.