When you have a character known more for their mouth than their brains being cornered by the Big Bad, this may ensue. With no ability to fight and no means of flight, they'll attempt to bribe their way out of death, giving promises that they may not necessarily intend to keep. Usually the character doing the bribing is an Asshole Victim as a means of creating some kind of Aesop. Examples:
Hello, Unknown Troper. You'll need to get known to lend a hand here.