Just Scream was a viral app created by Chris Gollmar using Twilio's Programmable Voice, designed as a creative outlet for people to scream and air frustrations during the COVID-19 pandemic. The app became an overnight success on TikTok with over 1.2 million videos in its #JustScream tag, where users would upload their own screams or react to others. To handle the sudden growth, Gollmar had to rethink his infrastructure, setting up a new Flask app and webhook to control the flow of traffic. The app's success exceeded Gollmar's expectations, with 131,000 recorded screams still available to listen to, although he has since shifted focus to collecting messages of hope from users instead of just screams.