Argument from incredulity

About
An argument from incredulity is a logical fallacy in which a claim is refuted on the basis that it merely sounds so "incredible" or "unbelievable" that any further evidence for the claim can be simply disregarded.

This is largely a form of emotional argument, combining peer pressure, argument by ridicule, and guilt by association: the refuter has scorned the claimant as ridiculous and unbelievable, and listeners to not want to earn the refuter's scorn as well by seeming to embrace the claim in any way -- even if only to ask to hear the claimant's evidence before deciding.

Reference

 * sees this as a kind of "appeal to the unimaginative"
 * redirects to argument from ignorance
 * : no equivalent page as of 2010-02-02

Applications

 * Claim CA100: the argument from incredulity in the service of anti-Darwinism