Understatement is Part Truth and Part Humor
This scene is from Indiana Jones and the Last Crusade, starring Harrison Ford and Sean Connery. It is a movie that earned Sean Connery an Academy Award for Best Supporting Actor, and was the third installment of the Indiana Jones saga. Connery played Indiana Jones’ father, as they searched for the Holy Grail, the cup from which Jesus Christ drank during the Last Supper. For those that drank from the Holy Grail, there was the promise of eternal life.
In this scene, the protector of the Holy Grail used the technique of understatement when the Nazi chose, and then drank from the wrong cup.
“He chose…poorly” drew laughs when seen at the cinema, because disintegrating into dust was putting the situation mildly. So, if you want to state something unemotionally and yet make an exteme point, then you can use understatement, as seen in Indiana Jones and the Last Crusade.