A couple things came to mind:
1. I have a Race Face stem that is either a 50 or 70 with 20-30 mm of rise. It doesn't work anymore because bars got bigger, but I can not throw it away.
2. I carry a tube patch kit box that I bought 15 years ago at Merv's Bike Shop in rural PA. The whole shop was nothing but rare vintage parts that an old dude collected over the years. I think I spent 2 hours just looking at stuff in there. Bought a patch kit and some oddball part that I don't remember. That patch kit box will stay with me forever, just because it reminds me of an awesome day and biking trip.