The fan ran across the field during the second half as Tottenham's Christian Eriksen was preparing to take a free kick just outside the West Ham area. The supporter ran up to the ball and lofted a shot that went over the wall and was heading into the net before goalkeeper Adrian comfortably plucked it out of the air.
The fan continued running, leaving the pitch with a steward chasing close behind.
It turns out his effort was actually better than Eriksen's, who sent his shot over the bar.
Tottenham won 1-0 after an injury time goal by Eric Dier.