It always goes the same way: You've all be drinking steadily for some time, perhaps it's a dinner party and the wine has been flowing, or just a good old-fashioned session at the pub.
Regardless of location or occasion, at some point the conversation will turn very deep and philosophical and all of a sudden, you'll find yourself wrangling with the deepest secrets of the universe over your eighth pint of Strongbow and black.
It is very likely at these points that you will wade right on in, regardless of how much you actually know about the subject, and start throwing wild theories around with so much gusto that no one will notice the fact that you blatantly don't know what you're on about.
But as wild as your musings get, it's always good to have a solid starting point so that it doesn't matter whether somebody says "so what's up with mirrors?" or wants to talk about quantum physics, you'll have a mind-blowing little truth bomb to drop on your increasingly rapturous and inebriated audience.
Just hope that there's no one at the party that actually knows their stuff, or you run the risk of getting either found out or very confused (or, more likely, both).
So...what is up with mirrors?