Take the full-grown moustache, for example, with down-turned ends at the corner of the mouth.

BBC: Moustaches under threat

There was a twist in one corner of her mouth, as if something were not right in her stomach.

NEWYORKER: Ziggurat

He had this black cold sore at the corner of his mouth, and his eyes had sunk into his face like little pits.

NEWYORKER: The Pura Principle

The eyes narrow and the mouth is awry, one corner twisting into an Elvis curl, though it looks too sour for seduction, let alone song.

NEWYORKER: Sail Away

His nose had been broken and his mouth was cut at one corner and the line of the scar across the upper lip and lower jaw showed through the growth of beard over his face.

NPR: Robert Jordan, Hemingway's Bipartisan Hero

His mouth curls at the right corner, thick eyebrows go their own way, and this casts his face in perpetual smirk, so that every woman who has ever been involved with him eventually arrives at the same expression, hands on hips, head cocked: Please.

NPR: Excerpt: 'Citizen Vince'

Consequently, for the first time since the days of the corner store (that was sustained or broken by a local reputation and word of mouth), virtually every brand must do what it says and act in the best interest of its customer set.

FORBES: Are Brands Entering An Era Of 'Truth In Advertising?'