Taylor Swift is good at putting on a kickass show. So, for Halloween night 2015, the 25-year-old went all out.
This time, she emerged onstage as Olaf. Yes, Olaf — the big, lovable snowman from Frozen. Her dancers were reindeers. Her fans, well, they were stunned.
And just like magic, out came Idina Menzel herself, performing artist and voice behind Frozen's Elsa.
Menzel joins a swarm of other artists who have made cameos on Swift's mega-popular 1989 Tour, including Echosmith, The Weeknd, Nick Jonas, Lorde, Walk The Moon, Fetty Wap, Nico & Vinz, and Andy Grammer.