Hidden Quests

We have been assured by the developers that there are, indeed, a number of 'hidden' quests already in the game. They are found by interacting with npc's that don't have a quest marker or even some objects that can be found in the world.
If you find any new ones, please add them to the list and, if you are able, add a page with details. See Templates. If you don't feel like messing with the wiki markup to add to the list, please leave a comment below giving the quest name and the location (and what sort of object provides it) and we'll investigate the new find. Thanks :)
Hidden Quest Name 	Where it's found
The Other Side of the Bridge	Oyster House
Contract Quests 	Fire Isle
Mausoleum Hidden Quests 	Mausoleum
Category:Quest
Category:Hidden Quest
Category:Oyster House
Category:Fire Isle
Category:5Isle
Category:Mausoleum
Category:8Squared