You decide to go as a clown. You always did like clowns, and figure that would be the perfect outfit to wear at the party, especially if nobody recognizes you.
As you write down what you want, you think about how this will affect you. You don't want to just be a person wearing makeup, wig and outfit. You will actually BE a clown, with your face and hair altered, your body reshaped to fit your suit, and your voice changed to match. You even decide to give yourself a compulsion to behave like a clown on impulse, and an ability to have sway other others who are dressed as and will turn into clowns for tonight.
As you finish writing and set down your pen, already you feel a strange tingling sensation coursing through your body. "Heheyaya," you giggle as you look at Ceridwen, as much as on impulse as genuine pleasure. "I feel...funny."