In celebration, McDonald's put out a frozen berry-flavored milkshake honoring the character.
However, TikTok started a trend involving the somewhat creepy character as their own form of tribute.
In the videos that have flooded TikTok, someone is seen wishing Grimace a happy birthday. They then take a sip of the shake.
Once the user takes the sip, the image shifts into Grimace and his evil concoction bring a horrific death upon its sipper.
Here are a few of the videos.
The comments on social media are almost as amusing as the videos.
The trend is pretty smart and the videos are very creative and a lot of fun.