She sharply pulls open the door to the room and snaps, "Get out!" In that voice Sanders' DeWitt replies, "You're too short for that gesture." OMG. Best moment in film ever.
On a semi-related note, I have recently become aware that my brain contains a (unintentionally compiled) list of Favourite Gestures in Film. Here they are.
Elaine Miller (played by Frances McDormand) in Almost Famous, pointing to Simon & Garfunkel's pupils as they appear on the cover of their album Bookends - "Honey, they're on pot."
Another one from Almost Famous; Penny Lane's elegant bird flipping
In Marie Antoinette Kirsten Dunst glides her hand outside the window of a carriage taking her home after a night of partying:
The gesture feels slightly anachronistic, perhaps because I've seen Dunst pull a similar move in Sofia Coppola's earlier film, The Virgin Suicides:
Donnie Darko is a film I used to love but now seldom think of. One of the few things that has stayed with me is the strangely poignant and funny exchange of waves with which the film ends: