EastEnders fans spotted a huge similarity between the soap and the film Titanic.
Tonight's episode saw the members of Albert Square gather on a boat on the Thames.
But there was lots of drama, including a serious argument between Ian Beale and Denny.
Ian discovered that Denny had been trolling Bobby Beale online for his religious beliefs, causing a gang to beat him up and put him in a hospital.
Ian went to the boat party to find Denny and tell him what had happened.
The pair argued and Ian ended up locking Denny in a cabin underneath - just like Leonardo DiCaprio was locked in a cabin in the classic 1997 film.
As the party raged on Denny started getting worried he was going to be left in the cabin and became frantic when the room started filling with water.
Ian raced down with the keys, as Denny screamed: "Ian let me out, let me out"
He tried to open the door, but dropped the keys as the water rushed into the corridor - in scenes also reminiscent of the film.
And viewers were quick to pick up on the similarities between the soap and the film.
Jackie Templeton said: "Ian dropping the keys, just like in Titanic."
Yasmin said: "Dropping the keys in the water, this is literally Titanic."
Leanne said: "Ok so someone being physically stuck in a room and their partner refusing to leave. Someone else dropping some keys in the water and running off and leaving people trapped with water rising. Is this basically Titanic: Eastenders edition???"
And Hayley said: "Starting to think #eastenders has watched the film titanic a little to much."
*EastEnders continues tomorrow on BBC1