Evil Leprechaun says...
Green beer, cornbeef & cabbage, pinching cute girls who don't wear green... sounds like another wonderful opportunity for carnal indulgence!
The "St. Patrick" claims of driving out snakes from Ireland is just another faerie-tale - all sources indicate that there were no snakes there to begin with.
* Why Ireland Has No Snakes. Educate yourself instead of believing some silly mythological nonsense.