You here a sound. It was faint at first, just at the edge of one's hearing, but as the wind kicked up, the sound came in clearer, louder: a screeching, grinding wail, rhythmically pulsing like the beat of a human heart. A light appeared, shimmering in time, and with every pulse grew brighter. Then, with a clunk and a whir, a large blur police box solidified, the wail petering off into a gentle sub-sonic hum. The Door on the side of the police box opens and a tall thin man pops out.
"Hello, I'm the Doctor." To the uneducated observer, the tall thin man looked like some kind of crazed old-fashioned professor, with his tweed jacket and suspenders and bow-tie, but he was too young to be a professor, his hair hair coiffed in some kind of pompadour. His eyes gave away what he was. Eyes that had seen empires rise and fall, galaxies come into being, stars being born. Eyes that had seen everything, eyes that were looking confused.
"Oh, I am terribly sorry sir, I seem to have wandered into here by mistake. Here, have a bag of jelly beans and I'll be going." And with those words the man popped back into his box and, in a method similar to its arrival only reversed, the police box vanishes. And as the last waves of sound fade a blond man in a black duster comes around a corner an walks up to you with a black backpack in hand.
"Here, catch." He says, tossing you the bag. "It's a bag of holding containing two generic guns, two generic swords, 4 generic knives, and 13 shuriken. Have fun and try not to maim anyone." and with that he walks off.