And even if it were as common as sneezing, déjà vu would still be difficult to study because it produces no measurable external behaviours
The Tease of Memory (via kevan del.icio.us)
Mr. Brown would also like to work with people with epilepsy, and with people who have the rare condition of suffering déjà vu pretty much every day. "I'm in contact with someone by e-mail who has almost constant déjà vu," he says. "Someone like that would be very fruitful to work with in the lab."
(also known as Autosomal Dominant Compelling Helioopthalmic Outburst Syndrome)
Naturally another scientist proposed another truly awful acronym, SNATIATION, which is a combination of "sneeze" and "satiation" and an acronym for "Sneezing Noncontrollably at a Time of Indulgence of the Appetite -- a Trait Inherited and Ordained to Be Named
Strange Sneezing situations