The mini brick keys we were getting came in a manila paper wrapping that was also wrapped in blue cellophane. We'd take a electric carving knife and cut the key in half, unwrap it, stick it on a window screen, and set the screen on a Dutch oven full of boiling water. The stuff would fluff up and expand like crazy. Then it went on the dining room table, on newspapers, under a ceiling fan until it was dried enough not to mold and to burn properly. Remember it like it was yesterday.
Sadly, everyone I can remember doing that kind of stuff with up and died on me. Bastards left me here with my memories.