10 Times Doctor Who Broke Its Own Canon

Blink firmly established that the Weeping Angels could only move when they weren't being observed.

Brilliantly, this meant that we, the viewers at home, could hold an Angel in place by watching it on our TVs. This little flourish from Steven Moffat and director Hettie Macdonald placed us firmly in Sally Sparrow's shoes, and implanted the terror of the Angels in the mind's eye of a generation of kids.

Which is why it was utterly baffling when, in Flesh and Stone, showrunner Steven Moffat and director Adam Smith decided to show us the Angels moving! While it's understandable to build tension as a blinded Amy Pond tries to navigate the Angels on some uneven terrain, this sequence took a rocket launcher to everything that had been previously established about the Lonely Assassins.

It's not just the fact that viewers should be able to hold the Angels in place – it's the fact that both Blink and this Series 5 two-parter clearly show that the Angels can move great distances in the blink of an eye. Literally! So when they do start moving, Amy should last less than a second.

Seeing the Angels turn their heads really really slowly greatly undermined their terror. By contradicting their lightning-quick movement, we no longer have a race of quantum-locked, hyper-intelligent assassins – we're left with a group of stone statues that move exactly like you'd expect stone statues to move.

Liiiiiiiiike thiiiiiiiiiiiis.