Episode four of Mr. Robot brought up one of the most hotly debated theories in online circles, and now fans are wondering if it could be a big clue for the show. Cisco tells Darlene that Romero stumbled onto some kind of illegal surveillance called “Operation Berenstain.” And now fans are wondering just what implications that phrase has on the future of the show.

Here’s what you need to know. (Warning: Spoilers through the end of Episode 4 of Season 2.)

Operation Berenstain was mentioned twice on the episode and fans got to learn that, yes, the word is spelled “Berenstain” in this universe too. All we really know for sure, so far, is that it’s some kind of highly classified operation, an illegal surveillance program of sorts.

But the word has real-life implications too — implications which could hint to its real meaning in the Mr. Robot universe. The word refers to The Berenstain Bears children’s books. However, many people remember the title being spelled as “Berenstein Bears” instead (or even “Bernstein Bears.”) In fact, so many remember it this way that an alternate universe theory has cropped up online concerning the two words. The idea is that people occasionally cross over into alternate realities that are almost the same, except for very slight differences.

I always figured something would eventually break me mentally and emotionally. I never thought it would be the Berenst(a)ein Bears. — Mack Lamoureux (@MackLamoureux) August 5, 2015

This is also referred to as “The Mandela Effect.” (It’s called The Mandela Effect because large numbers of people “remember” that Nelson MAndela died in prison. When they realize that’s not what happened, they feel like their memories aren’t in sync.)

The Berenstain theory is that a large number of people crossed over from a universe where the books were called “The Berenstein Bears” into a universe where they are “The Berenstain Bears.” An alternative theory is that two similar universes combined somehow. This Reddit thread explains the theory in-depth, as does this article on Vice.

The word’s use on Mr. Robot might imply that some type of time travel or alternate universe theory is being used on the show. Or it might simply symbolize how Elliot’s world feels like an alternate universe compared to Mr. Robot’s world. Elliot feels as if he’s living in two separate universes that are similar, but very, very different.

Or it might reference the idea that Elliot’s own memories of the past are faulty. In the Season 2 premiere, we saw that his memory of how his dad acted when he fell out of a window was actually caring, willing to give up his own health care for his son, in contrast with Elliot’s other set of memories that his dad purposefully pushed him out.

Perhaps at one point, Mr. Robot will take completely over Elliot’s mind and become the narrator himself. If this happens, we the viewers might feel like we’re living in an Operation Berenstain. If Mr. Robot became the narrator, he might reveal just what an “unreliable narrator” Elliot was, and we might learn that the universe Elliot showed the viewers was very different from reality.