Looking at The Moon

Paddy and Seamus were walking home from the pub. Paddy says to Seamus, 'What a beautiful night, look at the moon.'
Seamus stops and looks at Paddy, 'You are wrong, that's not the moon, that's the sun.' Both started arguing for a while when they come upon a real drunk walking in the other direction, so they stopped him.
'Sir, could you please help settle our argument?
Tell us what that thing is up in the sky that's shining. Is it the moon or the sun?' The drunk looked at the sky and then looked at them, and said,
'Sorry, I don't live around here.'