2. 77 runs in an over not 36 is the highest number:

Even if you are a die-hard cricket lover, you only know about the 36-run in an over scored by Ravi Shastri, Yuvraj Singh and Garry Sobers. But, you will be amazed after knowing this fact the highest runs scored in a single over is 77– not 36– astonishing yet true fact of the gentleman’s game!
It took place when Wellington and Canterbury locked horns. As Canterbury are playing to draw the game after losing 8 wickets, the Wellington skipper tried a plan by giving away free runs just to make Canterbury feel like winning the game. For the same, he asked his batsman to a bowl and he gave away 77 runs in an over. In fact, he bowled only five balls but the umpire lost the count.