Ok this is a true story, I'm not making it up.
In the olden days of legend and yore, there was once a guy
Human of race and Jimbo of name
Whose flatulence skills put even orcs and mountain trolls to shame
He once decided to see
What'd happen if for days he held his pee
He started having all kinds of drink
Until his bladder filled to the very brink
It was a mortal pain unto the last
At which point with a mighty blast
He shook the very castle walls asunder
And was afterwards never again to be found neither above nor under.