Some companies' DRM is stupidly cruel, punishing only those who have legitimately purchased the game, and not those who pirate it. Well, most companies' DRM is that. Serious Sam 3's DRM is brilliantly cruel, punishing only those who pirated it. By relentlessly pursuing them with a giant invincible armoured scorpion. As revealed by Dark Side Of Gaming, only those who unlawfully duplicate the game encounter this immortal enemy, who haunts them from the opening moments. You can see it in action below.
The only problem now is, I'm quite tempted to pirate Serious Sam 3 just to see this happen.
Thanks again to Craig.