I have a few good stories from my mission, but I can't top this story.
It occured in the apartment of my first area, but luckily for me, before I arrived. 4 elders lived in the tiny apartment that had 2 bunkbeds that were lined up perpendicular to each other & were about 4 feet apart, & my comp was present for the event.

As happens with many young dumb & bored missionaries, one night they decided to see if the old "blue-dart" stories were true. Well these young lads were delighted to find out that the stories were true & were soon "lighting up" with every good opportunity.
Well one morning as they were taking turns doggy dishing it (showering) & reading, one Elder decided he might just possibly have a record breaker & wanted to light it.
He stripped & readied himself in the "legs up in stirrups" position on the lower bunk & got the lighter into position.
Well, to this elders surprise, methane gases were nowhere to be found, & out came a watery brown stream of butt urine.
The stream flew accross the room like a fountain burst shot out of the Bellagio Fountains (just not the same color) & arched into a landing squarely into the chest of the poor elder reading his scriptures on the bottom bunk of the other bed.
Needless to say, they were over the blue dart thing when I arrived.