The phrase alguem tem que ver isso ai is everyday Brazilian Portuguese used when something is too funny, strange or impressive to witness alone. Online the recorded line became a shareable reaction sound, passed between chats and reused under short videos as a verbal pointer to whatever appears next. Its appeal comes from the shared feeling behind it, the need to call someone else over to look. Because it does not describe a specific event, creators can attach it to almost any surprising clip and it still feels natural and current.