A possible summary is:
The video is about a group of friends who are trying to find out who is the mysterious person who has been knocking on their door at night. They suspect that the person works at a zoo called Out of Africa, where they find a barcode that says "employee ID". They go to the zoo and encounter various animals and staff members, but they are not sure who is the knocker. Meanwhile, one of them, Chad, has his last day of radiation treatment for cancer and rings a bell to celebrate. However, they also learn that someone has broken into their safe house in Las Vegas and left a gun behind. They wonder if the knocker followed them from Arizona to Las Vegas and has a personal vendetta against them. They decide to go back home as soon as possible and thank their viewers for their support and help.
Here are the key facts extracted from the text:
- Someone has been knocking on the doors of a house in the middle of the night and spying on the residents. **(Fact 1)**
- The residents find a barcode that says Out of Africa employee ID and suspect that the knocker works at a zoo in Arizona. **(Fact 2)**
- One of the residents, Chad, has cancer and is undergoing radiation treatment at a hospital. **(Fact 3)**
- Another resident, Daniel, sees a suspicious car following them to the hospital and confronts the driver, who turns out to be their friend Justin. **(Fact 4)**
- Chad finishes his last radiation session and rings a bell to celebrate. He still has pain and doesn't know if the cancer is gone. **(Fact 5)**
- The residents go to the Out of Africa zoo to look for the knocker and encounter various animals and employees. **(Fact 6)**
- They receive a call from Brian, who tells them that someone broke into their safe house in Las Vegas and had a gun. **(Fact 7)**
- They decide to go back to Las Vegas as soon as possible and ask for the viewers' help to identify the knocker. **(Fact 8)**