Parade-goers pose for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

Parade-goers pose for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

Parade-goers pose for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

Parade-goers pose for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer poses for a picture during the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade participant marches in the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer watches the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

Parade participants wait to march in the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

Parade-goers watch the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

A parade-goer watches the annual St. Patrick's Day Parade along Fifth Ave in Manhattan on March 17, 2014 in New York City.

People watch the annual St. Patrick's Day parade from a roof in Boston, March 16, 2014.

A dog dressed for the 2014 Detroit St. Patrick's Day parade, March 16, 2014, in Detroit, Michigan.

A young boy practices on his trumpet prior to marching in the St. Patrick's Day parade, March 16, 2014, in Sydney, Australia.

A man wearing a costume with the Irish flag colors takes part in a St. Patrick's Day parade in London, March 16, 2014.

Toronto Mayor Rob Ford takes a selfie with revelers at the annual St. Patrick's day Parade, March 16, 2014, in Toronto.

Spectators watch from a window during the annual St. Patrick's Day parade in Boston, March 16, 2014.

The Chicago River is dyed green in celebration of St. Patrick's Day in Chicago, March 15, 2014.

Two young girls watch the St. Patrick's Day Parade in Erie, Pa., March 15, 2014.

St. Patrick's day celebrations are visible in a reveler's sunglasses at the annual Porterville Breakfast Lions Club St. Patrick's Day Brewfest in Porterville, Calif., March 15, 2014.

"Shamrock," an Irish wolfhound, walks in the St. Patrick's Day parade in Chicago, March 15, 2014.