I visited Mackinac Island during my honeymoon. I wasn't going to buy anything (I hate tourist traps), but Laura required me to purchase a T-shirt at the very least. I picked this one because it looks like a thrift find (even though it isn't). As far as I know, there is no Mackinac University. If it existed, though, they would probably offer some interesting courses. Here's a sampling:

ECON 4730 "Somewhere in Time's Economic Impact"
ANTH 2030 "Tourists: The Invaders"
HORT 3730 "Why We Have So Many Stinkin' Lilacs"
LIFE 1000 "How to Ride a Bicycle" (no credit)
BUSI 2010 "Fudgemaking"
PHYS 6830 "Time Travel in the Grand Hotel"
ANTH 4200 "The Two Churches on the Island"
HIST 3310 "Really Dead People in the Cemetery"
BUSI 1000 "Selling T-shirts is Easy"
LIFE 1050 "Don't Step in Horse Poop" (no credit)

No more quotes about shirts! Ever!