Light bulb

Paddy and John are working on a building site. Paddy says to John, “I need a day off, I’m going to pretend I’ve gone mad!”

Paddy climbs up to the rafters, hangs upside down from them and shouts, “I’m a light bulb! I’m a light bulb!” While John looks on in amazement. The foreman shouts, “Paddy go home, you’ve gone mad!” As Paddy packs his kit, the foreman sees John packing his kit as well. Foreman says, “John where do you think you’re going?!” John says, “Well I’m not working in the friggen dark!”