Swarfega
I used to run a printing shop at school, which generally meant the usual mucking about only with more ink. One day we got into a swarfega fight, using metal rulers to flick blobs at each other. Good clean fun, har har.

Until a blob sailed into my mouth. I can report that Swarfega doesn't have an unpleasant flavour; it has about twenty. I couldn't get the taste out of my mouth, and it would gradually morph through the entire spectrum of nastiness: bitter, soapy, acid, chemical; if there was a flavour that you wouldn't want to taste, it arrived sooner or later.

I don't recommend it.
(moon monkey is busy making memories worth repressing, Thu 26 May 2011, 17:06, 1 reply)

In a similar vein..
When I volunteered at a computer recycling place, we used to squirt syringes of heat transfer compound down the back of an unsuspecting victim's neck.
(universalpsykopath loves what you've done with your hair., Thu 26 May 2011, 19:48, closed)