According to Know Your Meme, TikTok creator @thefrazmaz was the first to post the video that's now become a meme. In the clip, posted on June 13, he showed himself excitedly trying the Grimace Shake.

McDonald's rolled out the Grimace Birthday Meal this week, and the memes came with it. ... it’s because June 12 was allegedly his birthday and the fast food chain rolled out a Grimace Birthday Meal.

McDonald’s new milkshake has gone unexpectedly viral on TikTok, inspiring a horror-themed meme in which people pretend to suffer a gruesome fate after tasting the “Grimace Shake.” Grimace ...

The birthday bash was planned by Sabrina's boyfriend and actor Barry Keoghan, according to People Magazine. What stood out from the party and went viral on social media was Sabrina's birthday cake.