Stink Bugs are creatures in Mother 3. They are first encountered in the Theater in New Pork City. They are known, as their name implies, to be extremely smelly. However, they also have extremely strong memories, as a researcher in New Pork City tells Lucas this fact and Leder tells his story with a Stink Bug nearby to remember the story. The Stink Bug can then be taken as a Key Item.
When the player uses the Stink Bug, Leder's speech explaining how humans came to the island is repeated.