Another outing for a much loved joke

I'm too tired to do a post that requires me to tax my brain so why not wheel out my all time favourite Irishman joke. I love it for the sting in its tail:

In the days before the Celtic tiger was even a cub an Irishman came to London looking for work. He went to a building site where the Foreman told him that he could have a job if he could answer this one simple question, namely:

"What is the difference between a girder and a joist"

The Irishman looked the foreman in the face and said:

"That's simple. Girder wrote Faust and Joist wrote Ulysses"

Ayethangyou!