His phone numbers and e-mail address are ever-changing, and he can drive the people around him crazy with his elusiveness and his propensity to mask details about his life.

NEWYORKER: No Secrets

For part of the journey, he wore a mask to make him anonymous like the real-life guides, which was supposed to add to the drama.

CNN: Pay to play a border crosser in bizarre tourist attraction

They often mask it with coffee or view drowsiness as just a fact of life.

WSJ: Unraveling the Riddle of Too Much Sleep

Though it is not, in itself, a life-threatening condition, trimethylaminuria leads many sufferers to heavy smoking (in an effort to mask their appalling odour) or, in at least one case, to suicide.

ECONOMIST: Hook, line and stinker