This primarily relates to my Grim North setting, particularly urban adventures in Nox Aeterna but hey...
Roll 1d20 in town for something strange:
1 The dark cowled figure whose face is the skull of a crow.
2 A drowned woman who speaks inscrutable dooms.
3 The moth like figure who flits between the dark spires and whose prophecies leave the recipient catatonic and irredeemably insane.
4 A pale, bald, fat (Kingpin fat) man with needle teeth and four arms. He wears a bloody apron and carries two cleavers and a pair of carving knives.
5 A dark haired woman who is seen to be washing your bloody clothes in a stream.
6 A man who dissolves into a hundred ravens or rooks
7 A large black dog with green eyes
8 A pot breaks. Then they all break.
9 A face is reflected in a mirror or pool. It has no eyes.
10 The shadows form a horned, fanged face. It speaks your name. It is gone.
11 You tip back your drinking vessel and snakes pour forth. Or worms. Or millipedes. As you prefer.
12 You see a person you are sure you know but they deny you three times.
13 A little girl whose eyes have been recently gouged out beckons to you but when you look back she is no longer there.
14 There is a well. It is dark beyond black. From within you can hear the echoes of gentle sobbing.
15 There is an urgent knocking at the door. There is no one there. When you close it, it starts again.
16 An old man falls in the street. He wails. If anyone touches him, he turns to ash.
17 A weasel crosses your path and stops to stare at you with malevolent eyes. If approached it becomes a snakes and vanishes into the nearest hole.
18 An old woman is selling lucky heather. She sees you, stops for a moment as if struck dumb and then approaches. She pins it on you with no charge and says "Where you are going, you will need this."
19 A beggar freaks out as you walk by. He throws his meagre takings in copper pieces at you saying "Take it, take it, just don't look at me."
20 You see cats. They're in alleys. On rooftops. In the windows of shops. They're watching you.