On April Fools Day Adult Swim released the first season 3 episode of Rick & Morty, which has been over 18 months in the making, and they not so subtly demanded that McDonald's brings its Szechuan McNugget sauce back!
The famous Szechuan, or "Mulan" as they called it in the show, sauce was mainly a promotional item McDonald's had to promote the animated Mulan movie back in 1998!
The character Rick loves the sauce so much that he traveled back in time to 1998 to get some and even said he would wait over 9 more seasons, or 97 years to get it if he had to later in the episode:
A petition on change.org to bring the sauce back has over 20,000 signatures and several of McDonald's chefs and its own social media have responded that they're working on it! Plus, with a new Mulan movie coming soon, McDonald's could easily revive the sauce!
Also if you can't wait for McDonald's to bring the sauce back, you can make your own with the help of this video made by YouTuber Andrew Rea: