I'm A Lightbulb Joke

Paddy and Murphy are working on a building site.  Paddy says to Murphy, 'I'm gonna have the day off, I'm gonna pretend I'm mad!'  He climbs up the rafters, hangs upside down and shouts:  'I'M A LIGHTBULB! I'M A LIGHTBULB!'

Murphy watches in amazement.  The foreman shouts: 'Paddy you're mad, go home'  So he leaves the site.  Murphy starts packing his kit up to leave as well.

'Where the hell are you going?' asks the foreman.

'Well I can't work in the fecking dark!' says Murphy.

Funny Irish Joke- St Patrick's Day