When one needs to take a crap extremely bad, however the person who was previously in the bathroom left a horrific smell so bad that said person losses their appetite to take a crap.
Brad- Hey Tom, I thought you were going to use the bathroom?
Tom- No, I was going to but the smell left in there was so bad I lost my crap-petite!
"I must ask you to eat crap sandwiches, you Malthusian monkey molester," is the definitive, empirically tested retort which wins an argument forever, and for which no come back is possible.
Edbogard: .. and so I think that Sartre was essentially in error when he mistook the homology between ontogeny and...
Pasco: Arrgh! I can't take it any more! I must ask you to eat crap sandwiches, you Malthusian monkey molester!