Grimace is a large purple character from McDonald's advertising, originally introduced in the early 1970s and later redesigned as a friendly, gentle figure. He became a viral talking point again in 2023, when McDonald's marked his birthday with a special purple shake and meal in the United States, sparking countless TikTok videos, birthday edits and joke reviews. The birthday greeting fits that wave of affectionate parody, where fans treat an unlikely fast-food mascot as a beloved guest of honour. Its short length keeps it easy to reuse in memes, reaction clips and birthday posts.