Not another Irish joke

Mick and Paddy were applying for a job on a building site. They were each interviewed and asked a few questions to see how much they knew about the work.

Mick went in first and came out to tell Paddy he had got the job.

"Did they ask you any hard questions?" asked Paddy

"Only one of them was hard. They asked me what was the the difference between a joist and a girder" replied Mick

"That's easy" said Paddy, "Girder wrote 'Faust' and Joist wrote 'Ulysses'.