Watch Neil Patrick Harris Sing the Theme Song from Doogie Howser M.D.

At 43, Neil Patrick Harris has a career that spans nearly three decades, but he still hasn’t forgotten one of his earliest roles — that is, the teenage medical wunderkind, Dr. Douglas “Doogie” Howser.

During Vogue‘s “73 Questions” at his Harlem townhouse, between rapping the lyrics to songs from the hit musical Hamilton and revealing How I Met Your Mother’s Barney Stinson’s best pickup lines, Harris took time to recreate the distinctive theme song for one of the first television shows he’s starred in, Doogie Howser M.D.

Harris also noted laconically that in 2016, a grown-up Doogie Howser would most likely be in “rehab.”

Watch the full clip below.