Undead Lockdown

Undead Lockdown is the 2018 comedy horror film directed, produced and written by Karen Gillan.

Plot
The film starts with Zoey's class learning about the volume and surface area of various 3D shapes. Zoey really need to use the bathroom, so the teacher lets her go with a pass and she walked off. Her enemy Emily smiles evily that she spiked her drink with laxative.

In the girls bathroom, Zoey placed a toilet seat cover in the stall before she go. Then, the scene fades to a few minutes later, showing Zoey texting her friends while taking a dump. Suddenly, she starts to hear an announcement go off. She heard that the student announcer begins screaming as something. Zoey heard the door opening and lift up her legs. She opens the door quietly and sees her friends barricading the doors in fear.

Cast

 * Chloe Grace Mortez as Zoey.
 * Bella Throne as Emily.
 * Karen Gillan as the Teacher.