Most of the Maddie jokes I've heard are recycled, but I like your limerick. There's something about that five line rhyming prose that can make anything entertaining, even filicide / gross negligence / whatever you want to believe. OK, I'll give it a shot:
There once was a girl from UK
She had such a terrible day
Over-sedated
Then heavily weighted
And sent for a swim in the bay
Damn, I'm going straight to hell. But at least then I'll finally be able to meet the McCanns.
By the way, if anyone is unclear on the definition of "filicide", just look it up on Google:



