Pulled a US Marshalls scene...
On the mission where you have the choice of killing the dude on the crane, I killed him and the mission was over.
Went back, got a running start, and jumped off the crane. I expected to splat on the pavement, but I landed on top of a dump truck, barely preventing my death.
Before I could stop laughing, Niko hit his head on the stoplight, fell off the back of the truck, and got run over by the ambulance from hell. Was very ironing.