WATCH: John Travolta’s son freaks out on stage at David Letterman Show

We hope John’s saving that replay for his 21st birthday.

On Monday night, John Travolta made an appearance on The Late Show with David Letterman with a special guest in tow - his four-year-old son, Ben.

Tonight! John Travolta​'s son makes his Late Show debut. Watch: https://t.co/vfTfRe2JcU pic.twitter.com/btuytDnthj

— David Letterman (@Letterman) April 20, 2015