What interesting myths do you know?

I'll start first

There are water devils (sullukyun) in my people. These creatures live at the bottom of rivers and lakes. Outwardly, they look like people of short stature, but without eyebrows and with hairy bodies, most often they often portrayed to have hooves.

The Sullukuns are very rich (they have a lot of gold, which turns into garbage on land) and love to play cards or dice. They can drag a person into the game and take away their soul. 

They leave the water only in winter from January 7 to January 19. Tanha. At the same time, on the days of their release, people wonder: it is believed that the sullukuns know the future and fate of people a year in advance, and they are overheard at ice holes or abandoned houses. People read fortune-telling on fire, silhouettes, saucers, and books. According to beliefs, at this time the water in the ice holes begins to sanctify, becoming unbearably hot for them, and they escape on land. 

At this time, it is forbidden to make much noise, arrange holidays, and approach frozen waters at night.

The main ways of fortune-telling :

1. People approached the ice hole or hid at the stable/stall to eavesdrop on sounds or fragments of human speech ("horse talk") that predicted imminent events 

2. They assembled a table made without a single nail, which, according to legend, began to move and answer the questions of the spirits by knocking or tilting. (Considered highly dangerous) 

3. The pan was chalked into sectors, the awl was turned and we looked at which answer or sector it would indicate. 

4. They went outside at midnight and asked the name of the first person they met — it was believed that this would be the name of the intended. 

5. Containers with water were placed (with sugar — for luck, with salt — for tears, with a coin — for wealth, with a ring — for a wedding). 

6. They ask a question, pinch a knife blade between the pages, or open a book at random, lighting a candle, and read the line that falls out as a prediction.

Many people still believe that. I'm no exception.