Back before MouseAdventure got to its current maximum size of 200 teams / 700 players, we occasionally had actual "scavenger hunts" as some of the quests. These days having 200 teams actually bringing us things during the event would be... a little more difficult to deal with.

Tabasco sauce packet

Having teams bring us Tabasco packets was just part of one of the quests, but it did ensure that we had a ready supply of travel-size seasoning whenever we needed it. For a year.

Invalid FastPass

To get an invalid FastPass, you first have to have a valid one. Most teams figured this out quickly and just hit the same FastPass machine twice in succession to get an invalid one.

Whiz ticket
I couldn't find a picture of this, and it's part of the history shared by just a very few people who played the first two a.d.d-quests. One of the items Kevin asked us to find, without explaining, was a "whiz ticket". I don't remember how we thought to ask at City Hall, but as it turns out a "whiz ticket" was used, back in the days before ubiquitous credit card terminals, for Disneyland cash handling paperwork. Needless to say City Hall would not let our team have one, but they would let me take a picture and Kevin accepted that.