Here are a couple examples from early on (http://www.youtube.com/watch?v=6LUkMPh7QPU).
It's also notable that Ami offers to use hers to 'take Rei's shape' when Rei thinks a guy who wants her to protect his valuables is a waste of time. The guy, who has met with Rei, doesn't notice it's someone else.
ALSO notable that it can give some temporary, very mild abilities. In anime, Usagi uses her equivalent disguise pen to become a ship captain so that she can steer the ship she's escaping on with Sailor Venus. In PGSM, the girls all wipe the court with some guys they challenge to teach a lesson to, after transforming into basketball players.
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It's also notable that Ami offers to use hers to 'take Rei's shape' when Rei thinks a guy who wants her to protect his valuables is a waste of time. The guy, who has met with Rei, doesn't notice it's someone else.
ALSO notable that it can give some temporary, very mild abilities. In anime, Usagi uses her equivalent disguise pen to become a ship captain so that she can steer the ship she's escaping on with Sailor Venus. In PGSM, the girls all wipe the court with some guys they challenge to teach a lesson to, after transforming into basketball players.