Charles Lamb (1775-1834) was an outstanding English essayist, poet, and literary author. Unfortunately, however, he was also noted for a bit of a quick temper and no inclination whatever to overlook discourtesy.
Once, in the midst of a lecture on his work, a loud hiss came forth from amidst the audience. There was a brief and embarrassed silence. Then Lamb said simply,
"There are only three things that hiss: a goose, a snake, and a fool. "Come forth and be identified ..."