Shrieker

The shrieker,, is ostensibly a monster in NetHack. While it has no attacks and moves very slowly, its ability to shriek gives it the ability to aggravate monsters and occasionally (1/10 of all shrieks ) summon a random monster somewhere on the level, 1/13 of which are purple worms (the explanation given for this is that purple worms enjoy consuming shriekers and are attracted by their shriek ).

The line "The shrieker shrieks." has gained a reputation as being one of the most memorable lines in NetHack.