Blink - a firm fan favourite of the new NuWho run - introduced the Weeping Angels as one of the Doctor's most formidable foes. The Angels are creatures who appear to be unassuming and seemingly non-threatening statues, but out of sight, they're extremely fast and can teleport their victims back in time to feast on the time energy from the days they could've had. Their speed was summed up nicely by the Tenth Doctor with this now iconic quote. "Don't blink. Don't even blink. Blink and you're dead. They are fast. Faster than you can believe. Don't turn your back, don't look away, and don't blink!" Lesson Learned: Even if something seems unimportant or unassuming, do not take that for granted, as it might just be dangerous...