My favourite Irish joke.

Paddy is working as a carpenter's labourer. The chippy asks Paddy to go down the scaffolding and bring him up a joist.

Paddy is gone ages. Eventually he reappears, hot, perspiring, out of breath and lugging a massive steel girder.

"Don't you know the difference between joist and girder ?" asks the chippy.

"Oi do sorr" replies Paddy. "Joyce is the fella as wrote Ulysees, and Goethe is yer man who wrote Faust".

Giles. Mogless in Paris.