This document summarizes a presentation on how web archives could be weaponized to alter trustworthy content or obfuscate the provenance of untrustworthy content. As web archiving and audio/video synthesis techniques advance, it will become easier to generate misleading evidence from archived web pages and media. However, web archives are currently unreliable witnesses due to issues like zombies, temporal violations, and potential attacks. Relying on a single archive is not sufficient to authenticate web content.