Jokes about intellectuals and such is it?

There was the foreman taking on labourers at the building site, and this big Irish Bloke comes along. And the foreman think's, I'll try out this one: "Come on Paddfy" he says. "Do you know what the difference is between joists and girders?"

"I do so - wasn't it your man Joyce that wrote Ulysses and that fella Goethe that wrote Faust?"