Zéquinha the portugese player in their under 20 squad will show you how to get an instant red card from the video below, it is not recomended that you try this in your next game, however if nature called and you just have the urge for a quick exit than the tutorial below will be of great help, of course you could just do a rash tackle and get a red card but why injure another player when you can get a red card via Zéquinha style?
This video was taken during the under 20 World Cup match between Chile and Portugal