In the cabman’s shelter in “Eumaeus,” a drunk red-haired man claims to be a sailor and introduces himself as “Murphy.” But it’s unclear if anything he says is true: he tells a series of improbable stories about sailing around South America, witnessing a stabbing in Italy, and returning to Dublin that morning after seven years at sea. Oddly enough, Murphy has never heard of Gibraltar, even though it’s located on one of the busiest shipping lanes in the world. Combined with Murphy’s outlandish stories, this leads Bloom to doubt whether he’s telling the truth.