There comes a time in a mans life when he shall partake of a deuce in the company of a women. Not in the boudoir, but rather the shitter adjacent.
Now, if your diet is high in fat, you shall find that your excrement shall occasionally float. In such an instance, flushing the poor fellow to his doom may be out of the question, due its plucky attitude to sinking.
There is nothing to be done at this moment but to grab a piece of toilet paper and delicately lay it over the top of the stool as if it were a burial shroud.
Leave and then hope that the next person doesn’t notice the surprise you’ve left, although I have to admit, this may be too optimistic a hope.