The easiest types to one-up are those who are rigid. Being rigid does not necessarily mean being humorless or charmless, but it does mean being intolerant of anything that breaks their code of acceptable behavior. Being the target of some anarchic or unconventional antic will trigger an overreaction that makes them look sour, vindictive, unleaderlike. The calm exterior of the mature adult is momentarily blown away, revealing something rather peevish and puerile.
