The sequel to "Happy Death Day" is finally in theaters and it won't take long for the movie to answer the biggest mystery to the first movie: Why was Tree reliving her birthday over and over again?
It turns out, Tree (Jessica Rothe) wasn't having some cosmic revelation. Rather, her time loop was the result of a quantum machine called SISSY developed in part by her boyfriend's roommate, Ryan (Phi Vu).
If you recently watched the first film from 2017, you're able to go back and find a few clues that hint at SISSY,
"So there's two spots," director and writer Christopher B. Landon told INSIDER. "The first one, it was the power outage. And then the second one was actually a sound in the opening credit sequence of the movie, the Universal logo."
Read more: The 'Happy Death Day 2U' director answers all the questions you have after watching the sequel
You may remember that in the first movie, there's a power outage each day at 9:23 p.m. After watching the sequel, we now know that was caused by SISSY. The second clue Landon mentioned is a bit tougher to find and occurs before the movie even really starts.
"When the logo repeats itself, it makes a very big crazy sound," said Landon of how to find the second clue. "That's the actual device powering off. So people actually hear, it's called SISSY in the movie, Sisyphus Quantum Cooling Reactor. That's the sound it makes when it goes off."
Here's the moment Landon is talking about:
Did you catch either of those?
- Read more:
- The 'Happy Death Day 2U' director answers all the questions you have after watching the sequel
- 'Happy Death Day 2U' teases a sequel — and if it happens, it will be the last one
- The man behind hits 'Happy Death Day,' 'Split,' and 'Get Out' is interested in doing his own cinematic universe like Marvel and DC has done
- How it took nearly 10 years to make the horror movie 'Happy Death Day'
