In New York, actor Norman Reedus from Walking Dead crashed a TV production class at St. John's University. Mashable was invited to the star's teaching session, and as it turns out, Reedus is much easier on the brain when he's not bashing in zombies' heads.

The prank was one of five, involving celebrities across the U.S. surprising unsuspecting students in the #BestDayEver, an April Fools' Day prank orchestrated by Chevrolet and activated by WhoSay.

Went back to school and Norman Reedus crashed the class to teach it. #BestDayEver pic.twitter.com/EJGtiomjC0 — ✨Christine Erickson✨ (@christerickson) April 1, 2015

As 10 to 15 students chatted nervously about the script project that was clearly overhyped by their (real) professor to throw them off. When the professor left the classroom "to take care of something," the students mused about him being up to an April Fools' Prank.

"Wouldn't it be funny if a celebrity walked in?" a student asked, as her classmates laughed, moments before one actually did walk into the classroom.

#bestdayever @chevrolet #ad A photo posted by norman reedus (@bigbaldhead) on Apr 1, 2015 at 11:59am PDT

The film students asked Reedus a few questions about technique and creative endeavors, but they were not shy about the real topic of interest.

"We just want to talk about The Walking Dead," another student said.

Reedus talked to fans about the show, warmly referring to the cast as "family," and immediately recalled his favorite episode. Unsurprisingly, it's "Still" (Season 4, Episode 12) — or the one where Beth and Daryl drink moonshine and everyone realized they belonged together forever.

As expected, the students tried to get any possible Walking Dead secrets out of Reedus, but the actor claimed that he had none to spill.

"They're like Fort Knox," he said of the real secret keepers, the executive producers.

True to Daryl Dixon's soft-spoken character, Reedus admitted that he doesn't actually memorize lines until the day of filming. While he and his character also share the same interest in weaponry and motorcycles (and all-black wardrobe), their ways of handling a zombie apocalypse are rather different.

"I'd probably break into a Four Seasons and watch South Park," Reedus said, matter-of-factly. When asked how his character would die if he had the choice (and if the producers would want to disappoint his many fans), he calmly said Daryl would simply walk off into the distance, on a hill, and a puppy would appear out of nowhere and follow him.

"People would just be like, 'What happened to that guy?'" he said. Though we're pretty sure the Internet would not let that one go, considering "If Daryl goes, we riot," is the meme-like battle cry created by his fans.

Reedus is one of five celebrities who are in on the extensive prank. Other April Fools' classroom appearances include Olivia Wilde, Alec Baldwin, Nikki Reed and Ian Somerhalder.