The weeping angel episode, titled “Blink“, is now considered a classic Dr. Who episode. The basic premise is that some creepy, weeping stone statues can move only when no one is looking at them.

AKITA--Just as suddenly as it started, a wooden statue of the Virgin Mary abruptly ... none of them could account for the sacred mother’s weeping. Early on Jan. 4, 1975, the figurine was ...