When did we get sent to the Backroom?
Dang... sorry if I contributed to that.
... Professor Quirrell, in his absurd turban, was talking to a teacher with greasy black hair, a hooked nose, and sallow skin.
It happened very suddenly. The hook-nosed teacher looked past Quirrell's turban straight into Harry's eyes -- and a sharp, hot pain shot across the scar on Harry's forehead.
So the first time Harry sees Snape (and Snape sees Harry, presumably) their eyes meet... and the last time, as well.
Have to admire a writer who knows her plot, and her characters, that well.