They turned just in time to see the shadow of Argus Filch looming over the wall behind them before the man himself turned the corner, hunchbacked, his jowls aquiver.
Even worse than Peeves, if that was possible, was the caretaker, Argus Filch. Harry and Ron managed to get on the wrong side of him on their very first morning.
" Very good, Argus, " she said. " You two, " she went on, gazing down at Fred and George, " are about to learn what happens to wrongdoers in my school."
When I had got into bed, and lay there footsore, weary, and wretched, I found that I could no more close my own eyes than I could close the eyes of this foolish Argus.