Surprised nobody has mentioned this one yet:
View: https://www.youtube.com/watch?v=V79dfs_1sFo
The end of the 2nd OT had everything: Van Arsdale shot with 10 seconds left; Westphal stealing the inbounds setting up the shot that gives the Suns the lead with 5 seconds; Havlicek shot that appears to win it, except there's 1 second left; Celtics heading to the locker room; Boston Garden fan fighting with the official on the floor; Suns taking a deliberate technical to allow them to inbounds at half court; JoJo White hitting the technical; and Gar Heard hitting a shot right at the buzzer to send the game into the 3rd OT.
Those 1970's teams get overlooked sometimes, but they were quite the juggernaut in their own right at their peak.