Mine was in 1983...as a 16 yr old, I jumped on a Raleigh Super Record with running pants, a t-shirt, and running shoes for the American Cancer Society Bike-A-Thon. Spent every bit of the 8 hours allowed, and ended up riding 120 miles. Shocked quite a few people that were "serious riders" since I wasn't kitted up to look the part. The following year I rode the event again (night after Sr. Prom) and managed to set a ACS chapter record of 150 miles. Still wasn't kitted up, but this ride was on an old Gitane TdF (have since inherited that bike and made it my winter trainer).