1. Find a copy of the libretto of Gilbert and Sullivan's "Ruddigore".

2. Turn to the point in act II where Ruthven (Robin) has just seen the ghosts, and Old Adam enters.

3. Ruthven refers to Adam as "Gideon Crawle", in the statement "Gideon Crawle, it won't do." This is a vestigial remnant of an earlier version of the libretto, where "I Once Was as Meek as a Newborn Lamb" had another verse, in which Adam changed his name to Gideon Crawle, as that was a more fitting name for a person of his new position (steward to a Bad Baronet of Ruddigore). Some librettos have changed "Gideon Crawle" to "Old Adam", but most still have the error.