An idea from a discussion on Fetlife:

Dressed as a super heroine, tied over a spanking bench, back pockets
loaded with bottle rockets/firecrackers and a pie just below your
face. Maybe a candle with the starter fuse to the bottle rockets attached
so you don't know when the fuse will light. There is a little lighter
fluid/oil on the pockets so when the bottle rockets go off, the seat
of your costume should ignite. There is someone standing nearby with a
paddle. when you want them to paddle out your burning butt, you have to
bury your face in the pie.

More to come....