In 1981, a deranged lone gunman named John Hinckley Jr attempted to kill US President Ronald Reagan. As an inspiration, he cited the 1976 movie Taxi Driver directed by Martin Scorsese and starring Robert DeNiro as a psychotic gunman who tries and fails to kill a popular U.S. Senator. Hinckley wanted to impress DeNiro's young co-star Jodie Foster by killing Reagan, hoping that she would fall in love with him. If Hinckley had succeeded in killing Reagan, what would've been the impact on the careers of Scorsese, DeNiro, and Foster? And how would the legacy of Taxi Driver be affected?