March Madness is the name given to the NCAA Division Basketball Tournament in the USA.
You guessed it, the tournament is played during March and features 68 College teams from across the country in a straight knockout.
It's a pretty big deal in the States as shown here in the final moments of the Kentucky v North Carolina game. The Wildcats certainly putting their fans through the wringer!
Having equalised in the dying seconds, Kentucky failed to take a time-out and allowed Tar Heels to go straight up the other end and win the match, progressing to the semi finals.