The line was supposed to be a dramatic turning point. Instead, the internet did what it does best: it repurposed the raw emotion for absurdist humor. Within a week, the “Not My Grandpa” sound had been used in over 400,000 videos—ranging from pet owners revealing that their “cat’s real father is the neighbor’s orange tabby” to people discovering their favorite coffee shop switched oat milk brands.

“The line was supposed to be about found family and grief,” Zimmer said, laughing over Zoom from her Brooklyn apartment, which she has decorated with a Franken-tree (half Christmas, half Hanukkah). “But then someone edited my face onto the Grinch, and I thought, Oh, this is the role I was meant for. ”

Then, the video cuts out. The word is never finished.

Let’s break down the three pillars of this bizarre, heartwarming, and utterly addictive new piece of holiday pop culture. The phrase “Not My Grandpa” first appeared as a soundbite on TikTok in late October 2024, lifted from an obscure indie holiday short film titled The Third Stocking . The film, which premiered at a small digital festival in Austin, stars young actress Zoey Zimmer as Chloe , a cynical 22-year-old who discovers that her beloved, recently deceased grandfather was not her biological relative.

If you have scrolled through TikTok, Instagram Reels, or even X (formerly Twitter) in the last 72 hours, you have seen the face. You have heard the line. But unless you are deeply embedded in the lifestyle corner of the internet where irony meets genuine emotional storytelling, you might be asking: What is actually happening?

Every holiday season, the entertainment industry tries to predict the next viral moment. Will it be a Mariah Carey resurgence? A heartwarming Hallmark trope? In 2024, however, the universe delivered something far stranger and far more brilliant: a blend of deadpan Gen Z satire, a fictional grandfather named “Not My Grandpa,” actress , and a fragmented meme simply known as “Santa Is Cu…”

You decide the rest. Stay tuned to our Lifestyle & Entertainment section for updates on Zoey Zimmer’s next move. If she finally finishes that sentence, we will be the first to report.