Amy: So wait, are you trying to tell me that magic is real?
Doctor: Yes! Well, no. At least, not any more. To put it simply, it’s a high-functioning genetic mutation which originated in 4th century Wales. BUT, since it’s the middle ages and people don’t bother to learn what they don’t understand, they label it ‘sorcery’ or ‘magic’. People became afraid of it. In fact, King Arthur’s father was so obsessed with sorcery he ordered the exectution of all those he thought practiced magic, innocent or not. Killed out the entire mutated line. Eventually in the end he grew mad with power and—
Doctor: Yes, Rory?
Rory: You said we were visiting Camelot, right? During King Arthur’s reign?
Doctor: Yes, why?
Rory: Well if Arthur’s King, then who is that?
Doctor: That… is… a problem.