Karl's Sister
Karl doesn't see his sister very often, he met her "for some reason in a car park in Wales" a few years back, but this didn't go well as he refused to look at her new-born baby photo as "When you've seen one baby, you've seen them all". Karl's defence was, this was her sixth child, had it been her first he would have shown more enthusiasm.
On her wedding day, Karl's sister was so excited and laughed so much she urinated while walking down the isle. She was not married in a church but rather in a registry office. Given the absence of isles in such establishments, quite where in fact she pissed remains something of a mystery.