"Look, a bird!" - a mundane sentence that's currently becoming a viral relationship test on TikTok. The so-called "Bird Theory" is supposed to show how attentive and connected partners are with each other.

One of the latest relationship tests to go viral is the “bird theory,” racking up millions of views on social media. It’s based on a theory developed by couples researcher John Gottman about the importance of engaging with partners when looking for a connection.