Whether you're already nursing a hangover from St. Patrick's Eve, or simply working on tomorrow's hangover, be safe and try to use as much common sense as a day like today will allow.
Besides Christmas, I've often found St. Patrick's Day to be the single most difficult day of the year to maintain any sort of budget sense. Last year, for example, with the holiday falling on a Saturday (which will happen again in 2012), Ms. Loonie and I marched into our neighbourhood pub with a couple of friends at 11:30 in the morning, and finally relinquished our table and headed home just after midnight. As you can imagine, my MasterCard bill for the day was in the hundreds.
I don't know about you, but I'm glad that sort of thing only happens every 5-6 years.