People from Ireland (which is known as the 'Emerald Isle') like to celebrate St Patrick's Day by wearing green and painting their town green. These guys really know how to party! They may even turn their favourite beer green for the occasion, although that's just to take money from drunken tourists - no Irish person would ever drink green beer .

'O'Rafferty's Motor Car' is 40 shades of green, according to the Irish folk song:

What a wonderful motor car
It's the finest ever seen
It used to be black as me father's hat
Now it's forty shades of green
- 'O'Rafferty's Motor Car' sung by Val Doonican