The fateful May 2005 interview with Oprah Winfrey was meant to be about Tom Cruise's film "War of the Worlds." It happened a few weeks after Katie Holmes and Cruise attended a red carpet event and made their relationship official. About a month following the interview, the couple announced their engagement. They had their child and married in 2006 and divorced in 2012.
Cruise was high energy during the entire 2005 interview, and he said the reason was, "I'm in love." Cruise repeatedly laughed (somewhat maniacally), knelt to the ground, hugged Winfrey, and intertwined his hands with hers, and pushed against them excitedly. Cruise ran backstage and brought Holmes out, looking a little aggressive as he practically pushed her the whole way. Holmes was a good sport about it, hugging Winfrey and Cruise and even giving Cruise a kiss before answering some questions.
Some people have credited Cruise's iconic (and strange) display as being the inciting incident to the modern age of celebrity gossip websites. Around the 10-year anniversary, Elaine Lui (founder of the Lainey Gossip website) wrote about how the couch jump heard around the world made it clear that traditional reporting on celebrities was not enough. Lui said, "This incident became one of the most critical chapters in the Origin Story of Internet Gossip" (via Lainey Gossip).
But you likely won't catch Freddie Highmore or his wife on gossip sites too much, due to their very private life.