Occam

"I photographed this UFO in the countryside last night. It was like a fireball blazing in the sky."

"I see."

"What do you think? Is it a meteorite, or something else?"

"Well, Occam's Razor tells us we should always prefer the simplest explanation. So, which one is likelier? That a lump of space rock has been floating around for millions of years, avoiding all that time to hit other heavenly bodies, just to fall to earth at the right time and place for you to take a picture of it?"

"Hum... if you put it that way..."