Whatever you do, don't blink.
First appearing in what might be the best single episode of Doctor Who ("Blink") since it was revived in the aughts, these are vicious statues that can only move when someone isn't looking at them. It's a must-watch that'll fill you with cosmic dread, even if the splash of Who campiness makes them occasionally spoopy instead of spooky. (For the grown up internet horror version, see SCP-173.)
That's it. See you next year! Unless we die and are ghosts, in which case we'll do our best to communicate with you from beyond the grave.