Definition of unintentional | Bee Dictionary of English

s without deliberate intent
s not done with purpose or intent
an unintentional pun
the offense was unintentional

The lovable ladies were unmasked as frauds--unintentional, mind you--but frauds nonetheless.
Obviously it is rich in unintentional comedy.
That would explain the unintentional conflagrations.

Accidental Science
Our V.I.P. and host of WNYC's Radiolab Jad Abumrad plays a game about unintentional scientific discoveries and inventions. Plus, guest musicians Paul & Storm keep with the theme of the game by performing their song "Live," which tells the story of a heartbroken mad scientist.
June 14, 2013 - NPR
Jad Abumrad: Accidental Scientist
The host of WNYC's Radiolab never set out to create a wildly successful public radio show that tackles hard questions about life and the universe. But that's just one of his many happy accidents. Hear as Abumrad reveals how he broke into radio, and plays a game about unintentional scientific discoveries.
June 14, 2013 - NPR
Clippers denied permission to talk to Rivers
Doc Rivers' prolonged inner debate over whether to return to the Celtics continues to generate an interesting, if somewhat unintentional, market. According to a source, Celtics president Danny Ainge denied a request from the Clippers to talk to Rivers earlier this week. As reported in today's Herald, the Celtics coach is now said to be open to other coaching possibilities after initially saying ...
June 14, 2013 - Boston Herald

Rashard Lewis in New York Times
I hope this unintentional mistake will not reflect poorly on our team and its great character,Lewis said. "I hope every athlete can learn from my mistake that supplements, no matter how innocent they seem, should only be taken after...
Tom Daschle in International Herald Tribune
I disclosed this information to the committee voluntarily and paid the taxes and any interest owed promptly,Daschle wrote. "My mistakes were unintentional."
Lawrence Dallaglio in Independent
For his part, Dallaglio, who retires from all rugby next month, said, "I acknowledge that my actions infringed the rules, although I wish to stress that they were unintentional and without any malice. I have apologised to Julian White. I hope that I...