When is a thigh not a thigh?
P I. 646-66: Why is the county of Kildare like the leg of a fellow’s breeches?
Stephen thought what could be the answer and then said:
— I give it up.
— Because there is a thigh in it, he said. [...]
— That's an old riddle. [...] You know, he said, you can ask the riddle another way? [...]
— There is another way but I won’t tell you what it is.
And it does seem as if this is an old riddle, with many variations. The basic riddle relies on the fact that the name of the town of Athy in County Kildare is pronounced ‘a-THIGH’, which opens up numerous punning opportunities.
The Freeman’s Journal of 24 September 1874 has this version, cited itself from the Hornet (published in London between 1867 and 1880):
The Sunday Independent knows another twist (22 December 1907):
Joyce suggests that there are unprintable versions. Perhaps he was thinking of this variation, collected by a 'Dr. Susruta' amongst British (presumably Irish) troops in Central India and published in Anthropophyteia, a yearbook publication covering popular culture with a strong slant towards sexual and erotic themes (1911, VIII. 394):