Professor told us a fun story, that was all the talk back in the days of USSR. So one day this guy wakes up and finds his wife is missing. Near his bed is an axe with blood and hair on it. Suddenly the cops show up and arrest him for the murder of his wife. Now that guys is, of course, confused. He says thats impossible, my wife was fine when I went to sleep yadda yadda all the shit. But the evidence doesnt lie. There an axe with his wives blood and hair near his bed and no one could find the wife. That guys is still adamant that he didnt kill her, but its no use. He was tried for murder of his wife, but due to the weird nature of the case, he got the minimum 10 years.

So this guy sits through his sentence, didnt cause any trouble, left with no issues and moved on with his life. So now one day, he's travelling on a train in russia and suddenly he sees his WIFE. She fine and with a lover. Turns out, the wife found a lover and they both decided to run away to Russia. And they covered her escape by framing her husband with murder. Natturaly, the husband was enraged and, in a train car full of witnesses, stabbed the everliving shit out of the wife.

And then he walked away scot free

Double jeopardy is fun