"I remember the waltzing, that's pretty easy, but I don't remember the tap dancing," Gosling explained.
"Is waltzing easy?" Kimmel asked.
"I think I know where this is going," Gosling said, suspiciously. "Are you asking me to show you how to waltz?"
As it turns out, it went exactly where he was expecting.
"I only know the guy parts, so that puts you in an interesting position," Gosling warned.
The two stood nearly cheek-to-cheek in front of Kimmel's desk as his band played some traditional waltzing music and Gosling got into his "strict dancing professor" persona.
"My forefinger and my thumb are going to start talking to your lower back," Gosling said as he put his arm around the host. "I need your lower back to pay attention."
While the two hilariously got up close and personal, Gosling couldn't abide Kimmel's frequent glances out toward the giggling audience.
"Stop the music! Who are you looking at?" he asked his flustered dance partner. "Are you dancing with over there or are you dancing with me?"
With the star's careful tutelage, Kimmel eventually actually managed to pull off a few moments of decent waltzing.
"You'll have to bleep that, but there's no other way to say it," he added.
After shooting the highly anticipated sci-fi film for five months in Budapest, Gosling said the two actually started to become good friends, with Ford even opening up to him a few times.
"I asked him one night who he got his sense of humor from, his mother or his father. He just stared me down and said, 'Sears,'" Gosling recounted, showing off his impression of his co-star’s gruff voice. "He said, 'I got it from Sears, and they were closing and I didn't have time to shop around, so I just had to grab one.'"
Earlier in the day, Gosling and his La La Land co-star, Emma Stone – who raved to ET about Gosling’s dance moves earlier this week -- got their hands and feet immortalized in concrete in front of the iconic Chinese Theater in Hollywood. While the tradition is a Tinseltown honor, Gosling said the whole thing is still a bit awkward.
"What [the photographers] want is for you to get down on all fours and the look up and smile," he joked to Kimmel of the uncomfortable pose. "It's not really your first choice of positions that you want to be in."
ET recently caught up with Gosling at the Los Angeles premiere of La La Land, where he opened up about his favorite memory of his early days in musical theater, long before he got his big break on the All-New Mickey Mouse Club in the early 1990s. Check out the video below to hear more.