First day I skied last season I got all suited up in the lodge and reached into my bag for my gloves. Nada, not even a some liners. Then I remembered they were all in a big bag of extra ski gear. I did not need another pair of gloves so I headed for the lost and found box where odd gloves and mittens end up. I found two gloves, not a pair, that fit, mostly, and headed out. Thought my hands would freeze before I got to the top of the lift, but I did get in several runs that day. When I got home the first thing I did was put the gloves in my ski bag.
Many years ago I drove all the way from Denver to Cheesman Canyon for fly fishing only to discover that I somehow forgot the reel. A couple of years ago I forgot my cycling shoes at home when I drove to meet some people for an evening ride.