The Most Insane St. Patrick's Day Treat You Can Get

Good luck eating this without turning green.

Happy St. Patrick's Day from Upper East Side sweets shop Serendipity 3, which just debuted a holiday-themed concoction that looks like Las Vegas in a cup.

The "Luck of the Irish Super Sundae" is an upside down leprechaun hat decked with shiny emerald-tinged tinsel and bursting with at least a half-dozen desserts.

The heaping sundae, which costs $19.95, is loaded with treats like a slice of green velvet cake and a hot fudge-topped scoop of mint chocolate chip ice cream; pierced with a Kelly green round lollipop and a twist lollipop; topped with a hunk of green-sugared whipped cream and sprinkled with mint chocolate M&M's, green apple popcorn and crushed green candy.

Some may call it the Yuck of the Irish. But no doubt others will line up for the Instagrammable delight.

Fans already come here for the Frrrozen Hot Chocolate, famously slurped by actors John Cusack and Kate Beckinsale in the 2001 rom-com "Serendipity."

And the eatery on Manhattan's E. 60th St., which opened in 1954, also offers an over-the-top option for those with money to burn. Serendipity 3 still offers its $1,000 Golden Opulence Sundae, which was introduced to mark the joint's 50th anniversary. Those ordering the Golden Opulence must give at least 48 hours notice for the sundae featuring fancy foods from around the world that are topped with edible gold leaf.

Two of these pricey sundaes have sold in the past week, according to the restaurant, adding that it sells about four per month on average.

Thankfully, you don't have to have a pot of gold to afford the Luck of the Irish Super Sundae. And as a bonus, each frozen treat comes with a marzipan ticket that you shouldn't eat. Instead, turn it in for a prize — which could be anything from an "I Love Serendipity" button to a $100 gift card to the spot.

The lucky sundae, offered for the first time this year, was dreamed up by chef Adam Goldgell. "There are two prizes in this sundae," Goldgell says. "First you get to eat it, then you win a prize."

Of course, if traditional fare is more your style, Serendipity 3 will be serving up classic St. Pat's dishes like corned beef and cabbage with red bliss buttered potatoes ($23.95); shepherd's pie ($21.95); and house-made Irish soda bread ($4.95), all available through March 17, St. Patrick's Day.