WATCH: Will Ferrell dresses as a leprechaun and warns us about the danger of snakes

Be prepared, it gets emotional.

Just when we thought we couldn’t love with Will Ferrell any more than we already do, he dresses up as a leprechaun and warns us about the danger of snakes.

Ferrell, who has Irish ancestry, decided to dress up as a leprechaun on David Letterman yesterday and sing his own re-written version of Danny Boy.