Cows are sometimes fistulated -- fitted with "windows" into their guts -- so researchers and veterinarians can study their digestive systems ... or so college football players can take an arm-dip in their innards, all the way up to the tattoos:
Maybe Mississippi State quarterback Dak Prescott did this for a class? Otherwise, it seems kinda unnecessary and animal abuse-y. Anyway, remember when you're watching Prescott throw passes this season that that throwing arm has been elbow-deep inside a cow.