The game Tuesday involved the trio taking turns confessing a random story about themselves, followed by an interrogation to figure out if they were telling the truth.
Rock was up first and said he once shared a joint with Woody Harrelson atop the Empire State Building. 21 Savage was convinced that Rock did it, and Fallon, despite having reservations, also agreed that Rock was telling the truth. The comedian, however, was lying.
Fallon went second and said the last person he dated before his wife, Nancy Juvonen, was model Gisele Bündchen.
"Does Jimmy Fallon have that much pimp in him?" Rock questioned before Rock and 21 Savage said it did happen. However, Fallon was lying.
21 Savage was last and said he was only a few hours away from getting his pilot's license in California.
"See, if he said Florida, I'd go, 'That's true,'" Rock joked.
21 Savage was telling the truth; Rock and Fallon thought he was lying.
"The first rapper to fly," Rock said.
Rock stars in the new horror film Spiral: From the Book of Saw. 21 Savage produced the soundtrack for the film and released in April a Saw-inspired music video for single "Spiral."
Spiral: From the Book of Saw topped the North American box office over the weekend, earning $8.7 million.