Can a bladder explode?

When i was young(er) my mother told us that when we hold our pee too long our bladders could/would explode.
Last night i waited a bit long to go to the toilet and this myth(?) came up in my mind again (For your information, i waited a bit too long, but i made it to the loo).
So, what does happen when a person holds his pee forever?
Can a bladder really explode, or does the body has a mechanism to make sure we loose our urine, no matter what?

Serious answers please, funnies are welcome too.

Edit: changed bladders in to blathers.