Well according to the helpful folks at jackinworld.com (your premier masturbation resource), there is a condition that causes you to sprog into your bladder.
How wierd would that be, you blow ya load and nothing happens, you goto take a piss and sperms fly out.
Anyway, I wonder if you superglued your knob end shut and sprogged, would it do that? That'd be a cool party trick.
(PS - How long does superglue stay stuck for?)