One of the comments from that 1st link you provided....
As gross as it may seem, kids do get a kick out of licking banana slugs and feeling their tongues go numb.
_______________________________________
Is that for real????
wait wait I got it...
If you can find another “slug” like the one that abused you yesterday...bring it into your work location, invite some coworkers over to your desk, ..then hit it with a hammer, and when they start to itch and swell up....watch what they do
Ta Dah!!
I have no idea, but getting past the gag reflex to actually lick one would be the first sign of a problem to me.
But, then again:
http://en.wikipedia.org/wiki/Escargot