Utterly at random at football on the weekend, talking with the other dads about "the trots".
One, in his younger days as a long-distance HGV driver, was afflicted while bunked in his cab.
Using the bag-and-bucket technique and, after cleaning himself up, went to dispose of the arisings.
Unfortunately for him though, there was a gang of other drivers congregating near the bins, and he was too embarrassed to dump the goods with them around. So, he went back to his truck, hung the bag from a convenient bit of his truck, and went back to bed.
When he woke up the next morning, his bag was gone...........

