Trivia: When was the Last Major Upset UM Pulled Off? Line >10

Just curious (sending the bat signal out to Wolverine Devotee if no one else knows) when was the last time we were a big underdog and pulled a "major" upset?  I don't mean -4 or -7 type of line but say -10 to-12+.  I know we were rarely in a position to be such underdogs but are we talking the late 60s?  Or has there been some game along the line I've forgotten where people gave us no chance and were flat wrong.  Outside of the obvious first Bo OSU game. 

Along those lines I wonder between say 1970 and 2007 how many times we've been underdogs by 10+ points in any game, anywhere, anytime.  I know 2008 forward it has happened relatively often but in the Bo/Mo/Lloyd era - not much after Bo's first team I imagine. Probably that 6-6 team vs BYU in the 86 bowl? Maybe one of the Rose Bowls along the way?  One of those undefeated or 1 loss John Cooper teams?  Even a game like Oregon 2007 I doubt we were -10, heck we may have been favored since we were at home.   FSU 91?  I imagine it was less than a half a dozen times in those ~40 years.