Oh, so that's how it works. It's simple, really -- you just, um... it's science.
"So, do they ever get off the island?" "I, don't, know. Uhura, is still, receiving, the, transmission!" "Gilligan!" "Sorry, skipper!" 20th century TV. One of the perks of faster than light interstellar travel!
(Shatnerday, Star Trek)
An old picture of a Beatles jam session contains a man who looks almost exactly like Matt Smith's Doctor. It makes perfect sense when you think about it. If I had a box that gave me access to all of time and space, chilling with the Beatles would be pretty high up on my list of things to do. I'm surprised it took The Doctor until his eleventh generation to get around to it.
Steven Moffat is pretty excited about the photo too.
"Bloody hell!!!" He tweeted, "Clearly we're going to make that episode!! Wonder what it will be like."