From The Wizard of Ozwhen the Munchkin coroner declares the witch most sincerely dead. Now commonly used for comatose organ donors who have been declared brain dead.
ICU Nurse: "We've got a comatose head trauma with a signed donor card. Just declared brain dead, so you can assemble the harvest team stat."
Transplantcoordinator: "How dead is he?"
ICU Nurse: "Oh, he's really most sincerely dead."
A phenomenon in where one song on an album feels out of place due to it not matching any other song on the album, comparable to the track Sincerely Me from the Dear Evan Hansen movie, which is an odd Black Comedy song on an otherwise mostly sincere and heartfelt soundtrack.
Tim: ever notice how I'm Gonna Win by Rob Cantor is weirdly different to all the other songs on his Not a Trampoline album?