One of the most well-known "happy accidents" in gaming history is the development of Grand Theft Auto (1997). Race'n'Chase, created by DMA Design (now Rockstar North), was once a top-down police simulator. The objective was straightforward: in missions featuring automobile chases and traffic stops, players drove as either police officers or criminals.

However, a serious flaw in the AI programming was discovered during playtesting. The "Cop AI" became extremely aggressive in place of the police cars trying to pull the player over or doing PIT tactics. Often resulting in dramatic wrecks, the police cars would suddenly lunge at the player, attempting to ram them off the road with reckless intensity.

The developers spent hours simply baiting the faulty, "angry" police cars to see how long they could withstand the turmoil after seeing that the testers were neglecting the intended missions. The bug turned a typical driving game into a desperate, high-stakes survival game.

The crew abandoned the police simulation after realizing that the "broken" AI was more entertaining than the game itself. They changed the project's name to Grand Theft Auto, shifted the emphasis to the criminal viewpoint, and leaned into the car chaos. In the end, this glitch gave rise to the whole "Open World" genre.

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