Plaque?
I don't know about you matey, but I don't have any teeth up my arse
(
The Coast Of Yemen,
Wed 10 Jun 2009, 16:53,
archived)
Yes, this sounds extremely unlikely. Marbles are round, and probably don't stick to the insides of squishy tubes.
(
The Alchemist king of the needlessly complicated,
Wed 10 Jun 2009, 16:58,
archived)