Yeah that's I.Marlene King, the executive producer and showrunner of PLL, talking about a very interesting fan theory she loved, BACK IN 2014. Thanks to Reddit user Javipll for bringing it to our attention.

She says that Troian, the actor who plays Spencer, sent her a theory about how Spencer has a twin, and that person was A.

"All of the information that this person thought out was really good," says I.Marlene in the video. "I thought to myself, 'Oh my gosh, this is a really well thought-out plan, it's a really good one!'"