What if we, the human race, are an alien's ant farm?  

I'll go you one better. We all know that matter is made up of molecues and atoms that wwirl around just like our universe does. So here is a theory to think about. What if our universe is just a small part or something else. we could be just one molecue of another creatrues fingernail or just a part of a large plant. See what I mean? We could go on with these hypothetical questions untill doomsday.

There's a science fiction short story on this subject. It's called "Bordered in Black" Offhand though I can't remember who the author was. Look it up though if you want to know what a human ant farm might be like...