This paper aims to share the Zoombombing: a new phenomenon that emerged during COVID-19, its causes, and measures to prevent Zoombombing. Finally, it provides recommendations to prevent such incidents. Zoom emerged as the most popular alternative teaching tool during COVID-19. However, even though Zoom has utilized state-of-the-art encryption methods, it has underestimated privacy expectations among its exponentially growing customer base. Zoom has many options settings for users to customize and secure their videoconferencing platform to minimize Zoombombing. However, some users overlook these security features, which leaves them vulnerable to offensive material displayed by attackers in a virtual classroom setting. Furthermore, most Zoombombings were made by insiders who had legitimate access to Zoom meetings, particularly students in high school and college classes. To reduce Zoombombing, teachers can enable settings, such as waiting room, restricting access to screen-share, and physical reporting. Moreover, severe institutional punishment for the attackers and their insider supporters can discourage such activities.