Century Media announced last week they'd signed a blackened death metal trio Canis Morsum. Then one week later, Century Media revealed that the band was actually fronted by dogs barking.
The label has since posted a short video explaining how they made the "vocals" on Canis Morsum's only song "Iniquitous Rites Of Kerberos" sound like actual vocals, fooling a decent amount of people in the process.
https://www.facebook.com/watch/?v=600790727173425