As part of the November A-Spell-A-Day challenge here is a spell to garner confusion.
Every Face a Thief
Muto Imagonem 20, R: Voice, D: Sun, T: Room
Alters the look and sound of all people in the room to match a chosen subject who must be present.
(Base 2, +2 Voice, +2 Sun, +2 Room)
Find this spell and hundreds more for Ars Magica in my grimoire.