Most difficult but really useful: A smashable guitar. Seriously, one I can smash and that you don't want back. It should already be broken, or a smashable/rebuildable prop. Fake is best but real? Only as long as it's not playable or reparable. I got ethics issues with smashing a viable instrument. I don't care what kind of guitar it is.
Not as difficult:
- Bullhorns and/or megaphones! Any kind. Five or six of 'em.
- Very silly glam-rock/costuming materials - terrifying wigs, boas, feather capes, anything glittery and bright that can be thrown on for what is literally a two-second shot. Shouldn't look good. I have some but could use more. Particularly capes.
This post originated on Dreamwidth journal ソ-ラ-バ-ド-のおん: Solarbird Makes Noises. comments at Dreamwidth.