The boys of One Direction are having some fun of their own onstage as they continue the U.K. leg of their first world tour.  In some footage taken by fans at their Monday concert in Newcastle, one of Harry Styles’ prankster bandmates appears to have mentioned the name of his ex, Taylor Swift, in the middle of their song “Little Things.” 

Just after Harry finishes singing the line “I’m in love with you…,” a quick but unmistakable “Taylor Swift” is heard leaving the mic of one of his bandmates.  Huffington Post UK notes that in the seconds before the name was slyly dropped into the song, Louis Tomlinson is seen mischievously whispering to Zayn Malik - perhaps revealing him as the guilty party.