His departure was the result of an extremely rare coup by key shareholders and senior members of the board.
Times, Sunday Times
Another group of illnesses, though widely feared, are extremely rare.
Smithsonian
It wasn't quite perfectly synchronised, but they managed the extremely rare double of being slightly resented winners and madly despised losers within six months.
Times, Sunday Times
He added that denied boarding caused by overbooking was extremely rare.
Times, Sunday Times
Or it could be linked to the syringing - though complications, such as a perforated eardrum, are extremely rare.
The Sun