So for the longest time I've had this recurring random wonderment. It's often rather difficult to explain to people...so much so that, as of late, I'd rather stopped trying. 

It's like, when we're little kids, our preschool and kindergarten teachers point to some colored squares and say, "That's blue," "That's green," "That's red," etc. And we nod our little heads and say yes. And we go home and our parents do the same thing with our favorite ball and our jacket and the grass outside and the sky, and the colors of all these things are roughly the same as the colors on the squares our teachers showed us, so we nod our little heads and say yes. But how do you know that little Bobby sitting next to you in class sees the green square (and thus, the grass) as being the same color you see it as? What if little Bobby thinks what you both call "green" is actually the color you see as "red" and visa versa? What if your green is purple to him? HOW COULD WE EVER FIND OUT IF WE SEE THE SAME THINGS THE SAME WAY???

...One of the really and truly incredible things about this online dating thing is that it has matched me with other people who, in their I spend a lot of time thinking about box, list that exact question (in their own words, of course). ...I didn't even include it on my profile because I thought it was too weird. Mysterious forces are at work here, verrrrry mysterious forces.