Microsoft Defender vs. MEGAWOMAN.
The danger whenever you create an anti-ad "viral" for your product is that it doesn't, well, sell your product very well. In fact, the somewhat-endearing MEGAWOMAN (above), arch-nemesis of Microsoft's free security software, does a pretty good job of unselling Defender—though a plus to writer/director Nir Bashan, the "NB" of the NB Agency in Los Angeles for getting sea Krakens and Al-Qaeda in the same sentence. Fyi, The wall at the end of the video is the Defender logo. Video below (via).
Previous Microsoft ad missteps: Microsoft's moronic Monsters' Ball. Welcome to the (fake) people_ready business. Microsoft mocks Gettysburg Address.