Wikiability

Definition
The act of proclaiming the ability to do certain things; however, like the truthiness of Wikipedia, there is no proof that the proclaimer can do it.

Examples
Often used in movies where the underdog is prepared to fight a bully, but because no fight happens (ie: bully walks away laughing or gets tickled and pats the underdog on the back, making amends)there is no proof that the underdog can win.