Ok so you might think this a joke, BUT so did I until I tried it out and showed it to the world.
Truth is, this is the best thing that I can think of :( But it’s really easy and you get a bunch of weird/awkward looks from people (which is always fun).
1) take a film canister
2) cut out a 1" chunk of it (side and bottom equally)
3) tape the remaining canister to the side of the camera (I used electrical tape) = SUPER WIN
4) hold stuff (i’ve included some potential “stuff”
Just find a bunch of stuff and have fun with stranger’s reactions.