He may be a small green goblin but donÃ¢t tell him that or he might show you otherwise.
A staff of great power in the hands off those who manipulate the strands of fate.
In the middle of an unimportant combat with some bandits a burst of wild magic transforms all of the PCs and their opponents in to random animals and monsters. They retain their intelligence (though not, of course, the ability of speech). They can either carry on the combat in their new forms, panic, or otherwise react how they see best. After about an hour, they return, unharmed, to their normal form.