Why?

Now that's a silly question. However I can tell you a little bit about its history. In 1989 the 6.9 Loma Prieta Earth Quake rattled the central coast and student's nerves. In an effort to relieve tension one student started a game of Simon Says in the Porter Dining Hall. It began with a simple act of raising a fork in the air but ended with taking off your shirt and then your pants. At this point the college students were kicked out of the dining hall for being inproperly clothed. The game relocated to Porter Quad and talk of starting the first First Rain began. The rest is history.→ Listen to an interview with Wayne Hendrickson, one of the students there during the makings of First Rain here