According to the official website, "Beer Bike is a combination intramural bicycle race and drinking competition dating back to 1957. Ten riders and ten chuggers make up a team. Elaborate rules include details such as a prohibition of "bulky or wet clothing articles designed to absorb beer/water or prevent spilled beer/water from being seen" and regulations for chug can design. Each residential college as well as the Graduate Student Association participates with a men's team, a women's team, and alumni (co-ed) team. Each leg of the race is a relay in which a team's "chugger" must chug of beer or water for the men's division and for women before the team's "rider" may begin to ride. Participants who both ride and chug are referred to as "Ironmen". Willy Week is a term coined in the 1990s to refer to the week preceding Beer-Bike, a time of general energy and excitement on campus. Jacks (pranks) are especially common during Willy Week; some examples in the past include removing showerheads and encasing the Hanszen guardian."