It's now been two decades since audiences first saw Harriet, Janie, and Sport dance as food to James Brown's "Get Up Offa That Thing" in Harriet the Spy. Seriously, it's hard to believe it's been 20 years since we first saw Harriet M. Welsch (Michelle Trachtenberg) get doused in blue paint, then bitch-slap snotty Marion Hawthorne (Charlotte Sullivan) with a blue-covered hand.

To celebrate the beloved movie (which was based on Louise Fitzhugh's novel of the same name) turning the big 2-0 yesterday (July 10), some of the cast took time to reminisce on social media.

Trachtenberg was only 10 years young when the movie came out.

"Twenty years ago today, July 10th 1996, Harriet The Spy opened in theaters. I was 10 years old, this was my first movie, and my dream come true," she wrote on Instagram. "I will always be honored to have been the girl who brought #harriet to life. The time has come the walrus said.... #hts 📽🎬✏️📓🔎 ‘I want to see the whole world, and I want to write down everything!’ ~ Harriet 💗."

Harriet's science geek friend Janie (Vanessa Lee Chester) remembered the time an experiment accidentally exploded all over her mom.

"20 years ago, on July 10th 1996 #HarrietTheSpy premiered in theaters. It was my second feature, #Nickelodeon's first #movie, and an absolute dream come true being a part of it," Chester captioned. "Here's to friendship tattoos, tomato & mayo sandwiches, and science experiments blowing up in your mom's face 🎉👏🏾😜."

Rounding up the last of the young trio is Sport (Gregory Smith), who didn't share a memory from the film himself, but he did retweet this epic GIF set.

See? It was the bitch slap heard 'round the world.

No word from Rosie O'Donnell at the time of this writing, but she's probably busy giving Golly-approved advice to the new generation, so we'll let it slide.