That just reminded me of a couple other nasty things I've swallowed:
When i was in middle and high school, i constantly chewed on pens and pencils. On more than one occasion have pens exploded in my face and mouth. Bic ball point pen ink is fucking nasty.
Also...
Years ago I used to go paintballing a lot. Also on more than one occasion have i been hit in the mouth area of my mask while my mouth was open. Thinking about the taste of that paint still makes me shudder.