USA Today published a video on Twitter that claimed that a chainsaw bayonet could be attached to an existing AR rifle.
The rifle was the model used in the recent mass shooting at a Texas church that killed more than two dozen people.
— USA TODAY (@USATODAY) November 8, 2017 
After becoming the butt of countless jokes, USA Today later admitted  that the mass shooter did not use a chainsaw bayonet in his attack, but maintained it could be a gun attachment.
Critics pointed out that a chainsaw bayonet is something in Hollywood movies, and is not used by rifle owners.