I have foldable scissors that are always attached to my keys. They’re useful for, well, cutting stuff.
Safety pins. Not only that you can use them for clothes (for example if your coat’s button decided to detach), you can use them for self-defense if you can’t have weapons or pepper spray.
A small notebook and a pen. You can write down important things or just doodle out of boredom.
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Then they just start speaking spanish for the rest of the movie
Stab them in the eye with a pin?
I have had to never use one for self defense, but I guess it would still be better than nothing.