I have two stories:
1) Friday field service always consisted of going on return visits that were close to, or on the way to, garage sales the pioneers had mapped out. Well, one Friday, there was a rich, fancy subdivision that was having a neighborhood garage sale. The only problem was that it was outside our territory and in the territory of another Kingdom Hall. We all swore each other to secrecy and went, stopping at laundrymats on the way, to keep our time going. I was a young teen pioneer when this happened, and it felt fun to be a bit of a rebel with the rest of the pioneers! Either they kept doing it or someone found out, but they totally got busted for it, and never did it again! (That I know of!)
2) The other pleasant memory happened when I was kid and we drove many, many miles to work unassigned territory. It was deep in the woods and I found the biggest piece of petrified wood I had ever seen! It was quite a find for a 10 year old. I still have it today!