San Andreas. Blow shit up, drive car off hills into rivers as cops follow you down to their watrery graves, abandon car, swim around, catch a flight, jump out with a parachute right in the precinct's lot, blow shit up, jack a cop car, run over some pedestrians, jack a light aircraft, attempt land it on top of a running train, total aircraft, steal a bike, pop some wheelies...
Rinse and repeat. You don't even have to think - just run around causing mayhem. Sometimes when I want to indulge in some braindead gaming, I just fire up Need for Speed Most Wanted, load a car with Level 4 heat and unleash hell.