Why not come as a great ape? When the guests are gathered, you would enter arms swinging, advancing toward the screaming lady with lowered head and grinning jaw.
28 seconds sound clip from the The Masque of the Red Death movie soundboard.
You can hear this line at 00:38:32 in the Blu-ray version of the movie.
Quote context
[...]
- I fear the Prince is much too austere.
- Everyone will dress as usual. A harlequin, a Chinese, a soldier, or a princess.
- They will all either be beautiful or humorous, but all will be obviously human.
- It'll be more than a costume. It will be a performance by the cleverest man at the court.
- Where would I get such a disguise?
- There is one in the room of stuffed animals.
- Another toy Prince Prospero never bothers with anymore.
- You really think it would cause a sensation?
- Oh, yes.
[...]