Bring back the Shamrock Sundae! On second thought, don't.

The shakes were first launched in the U.S. in 1970 and were initially called the "St. Patrick’s Day Green Milkshake" before adopting the name "Shamrock Shake".

Via: soundadvicefortoday.com

Harold Rosen, a McDonald's franchisee owner in Enfield, Connecticut, claimed to have invented the shake in 1966. The McDonald’s Corporation has disputed Rosen's claim.

Via: cerealbits.com

In 1978, McDonald’s introduced Uncle O’Grimacey (the Irish uncle of Grimace) as way to promote the shakes. The character was phased out in the early ‘80s.

McDonald's introduced the Shamrock Sundae in 1980.

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