I play a similar game at work
but I'm a primary school teacher rather than an illustrator.
(SnowyTheRabbit occasionally Fearless Egbert, Wed 23 Jan 2013, 16:32, Reply)

You hide a cock in every child?

(mattcoxonline is currently Offline., Wed 23 Jan 2013, 16:37, Reply)

That
was the joke.

Although it's not funny for the kids, really, I should probably stop doing it...
(SnowyTheRabbit occasionally Fearless Egbert, Wed 23 Jan 2013, 16:54, Reply)