NES player darbian just broke his own record for the fastest time through Super Mario Bros. He completed the entire game in just 4 minutes 57.260 seconds. But the most entertaining part of the video is watching his heart rate slowly creep up from 80 bpm at the beginning to ~140 bpm in World 8-2 and spiking to 171 bpm when he beats the record. (via digg)
Update: Compare that with this insane level from Mario Maker:
(via @pieratt)