I don't think they do, but I hate the forced touch ones. Indiana put a rock in their stadium a few years back and I think it's kinda a copy cat type thing.
If we do something like that it should have importance assciated with U of M football...maybe build a brick wall with old Memorial STadium bricks right outside the locker room and the team can touch that? Put Bruce Smiths Heisman in the middle of the locker room? Bronko's old jersey? Or maybe they should pour real Mississippi River water on themselves before they take the field? The power of the river will give them strength?