I've seen this loads of times in different subjects. I've never heard what the solution is, or if there even is one.
You and your mate have just been arrested for murder. You're both whisked off to separate rooms where you're questioned. The deal is this, if you both plead not guilty, you're both released, and all is good. However, if you plead not guilty and your mate pleads guilty, you get life, and he gets 10 years. If you both plead guilty, you both get life. What do you plead?
if there is a tonne of evidence to say you committed the murder plead GUILTY asap cos you'll get sentencing discounts and the ability to appeal if convicted.
If there ain't much evidence and you're feeling cocky, plead NOT GUILTY as in a crown court juries are sooo stupid you've only got a 40% chance of getting convicted. stupid really!