Things can get intense during an Ivy League football game.

Dartmouth and Harvard squared off on Saturday in the latest installment of a rivalry that began in 1882. Harvard won that initial game and has dominated the series in recent history. Harvard has won every matchup since 2004 and is looking to keep that dominant stretch alive.

Dartmouth, however, was off to a 5-1 start heading into this year’s matchup with a shot at a conference title. The Big Green started off strong with a 14-6 lead heading into halftime, but a dismal second half allowed the Crimson to take the lead.

Tensions are always high in a rivalry matchup, but a costly turnover by Dartmouth proved to be too much for one coach to handle. It was reported that a Dartmouth assistant punched a window in the coaching booth after Harvard recovered a fumble.

WHRB Sports shared the news on Twitter:

Harvard is currently clinging to a 25-22 lead late in the fourth quarter.