The phrase lo que hay que ver translates roughly as you have to see this, a common Spanish expression for pointing out something surprising, absurd or hard to believe. In this clip, Sandra is addressed directly, which gives the sound a personal, conversational feel rather than a generic announcement. That direct address is part of its appeal online, where short voice reactions travel between chats and edits because they can stand in for the viewer's own response. Its humour comes from recognition, as listeners instantly understand the urge to show someone else what they have just seen.