This 7-foot tall, 31.5 stone high schooler might be the biggest American football player ever (Video)

They don't mess around in high school sports over in the States.

We've already shown you the kicker who uses the ref's face to score a point - but this guy could cause even more damage. John Krahn is a high school student from southern California who is 7ft tall and a whopping 440lbs - that's 31.5 stone. Needless to say, he towers over the rest of the players on the field. According to Max Preps, Krahn 'is taller than any player to ever play in the NFL, and is roughly the same size as WWE superstar Big Show.' You can see him for yourself in the video below: