Wreckfest

Create a Custom Event
Gamemode = Deathmatch
Against 23 AI on lowest difficulty
Damage = Realistic
You = School Bus
AI = Lawnmowers
Track = Madman Stadium Demolition Arena or other small tracks

Create a Custom Event.
Deathmatch with 23 AI.
AI = Random Large Special Vehicles
You = Lawnmower
Damage = Realistic
Track = Madman Stadium Demolition Arena

Just sit back, die and respawn to the AI for a game or two.
EZ PZ