Rick and Morty fans around the nation filed into select McDonald’s locations on October 8th with one thing on their minds: szechuan sauce.

Back in 1998, McDonald’s released a special limited-time sauce that was meant to taste like traditional Chinese szechuan sauce. This sauce was brought to locations as a promotion for the Disney film Mulan, and was removed from the restaurant’s menu soon after the movie was released.

For years afterwards, this promotion began to fade from people’s memories. Until about half a year ago, the vast majority of McDonald’s customers had forgotten the sauce ever existed to begin with. This sauce would have remained a forgotten memory, if it weren’t for the increasingly popular cartoon Rick and Morty.

In April, Rick and Morty had a surprise season three premier air on television. The episode aired on April Fool’s Day, 2017, and fans everywhere were stunned. The premier had not been announced whatsoever, and as a result, it generated even more talk than usual due its odd release.

The episode contained references to McDonald’s discontinued schezuan sauce, with one of the show’s main characters, Morty, ordering schezuan sauce in a dream-like sequence. The sauce is again referenced at the end of the episode, with Morty demanding that he will one day experience the taste of the sauce.

Due to the general goofy nature of Rick and Morty fans, as well as the surprise airing of the episode, schezuan sauce began to experience an extreme spike in popularity. Fans everywhere were writing to McDonald’s on social media and otherwise, demanding a return of the schezuan sauce.

McDonald’s eventually responded to the demands by sending a special delivery to Justin Roiland, a writer for the show and the man who voices both Rick and Morty. Rolland posted a set of pictures on Twitter of a four pound bottle of the coveted schezuan sauce, complete with a letter that hints at an eventual return of the sauce in restaurants.

McDonald’s carried through on this promise, re-releasing the sauce into select restaurants on October 8, 2017. One such location was the McDonald’s on University Ave near Hamline’s campus. Though fans were ecstatic to be able to taste the sauce once more as Morty had, McDonald’s did not properly prepare for the event.

“One of my friends waited in line for over an hour waiting for them to bring out the sauce,” said Gwen Fairlie, a first-year on campus. “He didn’t even get any of the sauce though; the restaurant sold out of all of it in about ten minutes.”

McDonald’s everywhere experienced the same unfortunate fate. Nearly every participating restaurant had sold out of their schezuan sauce within an hour, and many were left unhappy.

In response to the negative backlash McDonald’s received, the company promised to return the sauce again this winter. They plan to release it in extremely higher quantities and for an undisclosed amount of time. Fans of the show and the sauce can only hope that McDonald’s does it right next time.