1969 late fourth Quarter and DONU trailing against KU 14-17, fourth down pass to Jim McFarland (TE) that is incomplete, but wait, pass interference called against KU LB.
KU Head Coach and KU LB BOTH called for unsportsmanlike conduct and the next thing you know instead of turning the ball over to KU on downs and losing the game (which would have meant starting the BiG 8 conference season 0-2), DONU has the ball first and ten at the KU 17.
DONU goes on to score, win the game, tie for the Big 8 championship that year, and begin their 32 game win streak which includes 2 National Championships.
Lose that one big play and who knows, the BoBfather never wins a National Championship, may have even been fired after the 1969 season with three straight years without a BIG 8 championship.
Most crucial play in DONU history, you bet it is.