They're so rare, in fact, that I had to go to Hawaii to find one.
Gun attacks in Britain are rare, a fact that authorities here attribute to extremely tight gun-control restrictions.
It'd be really rare, in fact almost never, that I would hire someone who had been at IBM or any big corporation for 15 or 20 years.
So rare, in fact, that many Egyptians strongly believe Amr Moussa was "kicked upstairs" to the Arab League by Mubarak who was envious of and feared his popularity.
Although many surgeons and organ distribution agencies contend that transplant mismatches are vanishingly rare, in fact, no one knows how often they occur.
So rare, in fact, that growers in the Rheingau were then desperately planting chardonnay in vineyards where riesling had ruled since the time of Charlemagne.
It was "so rare, in fact that nobody was actually looking for it," writes Wondrich in his preface to a facsimile edition published by Mud Puddle Books two years ago.
It's the rarest bird of the Old World, so rare, in fact, that it hasn't even been glimpsed for nearly a decade.
So rare, in fact, that when Shiva Soroush did so for all of three minutes last year the entire audience took to their feet.
Although galaxy collisions are frequent and clearly seen at many locations on the sky, stellar collisions must be extremely rare; in fact, none has ever been reported in the history of astronomy.
