> Can you help me with a word? This a noun for someone who
> innocently joins a group, comes to a party, sits at a
> meeting--whatever--and within minutes has everyone at each other's
> throats. It may be based on a mythical beast or malevolent force.
> The effect is pernicious, malefic, and usually completely innocent on
> the part of the individual who usually sees him- or herself as only
> trying to be 'helpful' and frequently comes out of the situation
> feeling hurt or unappreciated.


A Frank Spencer?