So, if someone told you they only saw in black and white, you'd probably call bull, right?

... Okay, that's actually a horrible example since it gives the beginning away, so let me think of something else. Let's see here...

Ah, I got it!

Picture this:

You're just raking the leaves, minding your own business, when some kid randomly walks up to you and starts talking. Then he tells you, literally out of nowhere, "Hey, guess what, I'm from Mars!" That is something you'd call bull on because, well, it's impossible. Aliens don't exist. Or, so you thought. So then this kid just walks off, and you don't see him again for a long time.

Years later, you run into him again and he's absolutely determined to prove he's actually from Mars. You don't give a crap anymore because really, who cares if some kid is actually from Mars or if he's just insane?

But, the thing is, you're actually really curious. You just don't want to admit it.

So... you let him try and prove himself, and it ends up being true. The kid phones home, shows you a glowy finger, then goes home on his mothership.

And then you're just left there... alone.