Effervesant!
Alas, not my idea but my brother once spent an afternoon handing out Sterodent tablets from a Trebor extra strong mint packet.

Apparently, the effect is best if you bite down on them; and even better if you his rather dribbley mate, Geoff...

First post. Sorry for lack of goatse, etc. 3 year lurker, and I gather you're meant to apologise for being new in general...
(Toxoplasmosis Dulce et decorum est pro sodomy coleslaw, Sun 21 Sep 2008, 8:17, 2 replies)

nothing to apologise for
however could you please explain this

and even better if you his rather dribbley mate, Geoff...


to me?
(misskitty reeks of sex and turpentine; laudanum afternoons, Sun 21 Sep 2008, 9:11, closed)

I'd imagine that he generally has more saliva in his mouth than most people, which would make for a more violent fizzing occasion.
(The Incredible Sulk Finally remembered his password on, Sun 21 Sep 2008, 10:51, closed)