The Stranger Things actor was photographed leaving the Electric Lady Studios in New York City on the same day as the Shake It Off hitmaker in June, leading many to wonder if they had been recording together. Joe was asked to address the speculation during an appearance on The Tonight Show Starring Jimmy Fallon on Thursday. "That was a very confusing day because I was just in there with (a friend), minding my own business, not doing anything and then I walked out the door and it was like a thousand people were standing out there,".