A University of Notre Dame tradition where you run up to the 13th floor of the Hesburgh library, stopping on each floor to drink a beer (thus, by the time you reach the 13th floor you have had 13 beers) and go into Father Hesburgh's office and shake his hand.
After doing the Hesburgh challenge, Billy had the worst hangover of his life.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.