While getting trashed and pinching people who aren’t wearing some shade of green even though you’re well past being a kid seems to be the order of the day on St. Patrick’s Day, Will Ferrell has an “important message” that he shares every year on the very same holiday.

Ferrell, donned in a costume that would befitting to a St. Patrick’s Day themed sequel to Elf, went on Letterman to teach us all the “real” meaning of the day and even did his own version of Danny Boy.

Maybe Ferrell could do a “Danny Boy-off” versus Paul F. Tompkins as his next stunt for charity?