Things associated with St. Patrick's day are shamrocks, the color green and beer! The Irish holiday commemorates their most beloved patron saint, St. Patrick, known for bringing Christianity to Ireland

But why do we wear green?

Green is associated with Ireland, also known as the Emerald Isle, but mostly because St. Patrick used the shamrock to explain The Trinity of Father, Son and Holy Spirit. People originally wore a shamrock on their lapel or clothing to commemorate the day, but it gradually became about wearing green in general.

Why do we get pinched if we don't wear green?

St. Patrick’s Day revelers thought wearing green made one invisible to leprechauns, fairy creatures who would pinch anyone they could see (anyone not wearing green). People began pinching those who didn’t wear green as a reminder that leprechauns would sneak up and pinch green-abstainers.

Why do we drink beer on St. Patrick's Day?

Originally, St. Patrick's Day was a celebration day of feasting and a day (during Lent) that restrictions were taken off drinking for the day. And beer is the predominant drink in Ireland.

And because as Benjamin Franklin said may times: "Beer is proof that God loves us and wants us to be happy."

[via SFist]