Wait! Lemme tell ya the one about the priest and the rabbi!
Source: The Dark Tower VII: The Dark Tower
Note: Character, a vampire that fed on emotions rather than blood, had crippled Roland Deschain and Susannah Dean by posing as a comedian and sending them into hysterics with jokes. Susannah had injured herself and exited to another room; while gone Dandelo had nearly killed Roland. Susannah returned just before he could finish Roland off, and Dandelo attempted the above to stall her; Susannah simply replied, "Heard it" and shot him dead.