dave & john are working on a building site. dave says to john
'I'm gonna have the day off, I'm gonna pretend I'm mad!'
He climbs up the rafters , hangs upside down & shouts 'I'M A LIGHTBULB!
I'M A LIGHTBULB!' john watches in amazement!
The Foreman shouts 'dave you're mad, go home' So he leaves the site.
john starts packing his kit up to leave as well.
'Where the hell are you going?' asks the Foreman.
'I cant work in the f****** dark! ' says john.