Last week, Fall Out Boy's Patrick Stump took the stage with Taylor Swift and together they performed a rendition of his band's 'My Songs Know What You Did in the Dark (Light 'Em Up)'.

They excited Swift's audience at the Met Life Stadium in East Rutherford, New Jersey on July 13 with a surprise collaboration and Stump told MTV News that she allowed him to "see a completely different world":

"It was amazing playing with Taylor Swift. She's a hell of an entertainer and her audience was amazing."

"It was just one of the coolest things and I felt very lucky to be there. She really gave a lot of love to the fans. We all were just very grateful for it. It definitely felt like getting to see a completely different world. It was awesome. I'm very satisfied with how it went."