If you've never had to urgently use the bathroom at a Mexican restaurant but when you get up to the door you find it's occupied so you wait outside in desperation until the person using it comes out and then you go in and see that the toilet is absolutely disgusting so you resign yourself to holding it in and dealing with the stabbing pains of 3 bowls of refried beans with cheese and valentina sauce desperately trying to exit your body one way or another -- then are you even capable of understanding the true nature of sadness?