I actually came up with a d6 list to help me decide what the goose would try to do if he showed up. I just feel that he isn’t the Horrible Goose if he doesn’t have some sort of goal in his mischief.

1. He wants to get a random character to use an item of GM’s choice. Example: get the fighter to use his backup weapon
2. He wants to catch someone in a trap, whether it be his own or another’s. Example: lock the rogue inside the treasure room
3. He wants to place an item of GM’s choice in location of GM’s choice. Example: rake in the lake
4. He wants to imitate a mundane activity done by humanoid races. Example: play drums by gathering the bard’s drum, a pot, a pan, a shield, and a stick/wand
5. He wants to cause someone to fall prone. Example: make the goblin slip on the grease spell
6. He wants to help the PCs with the next puzzle.