So cool! The entire panel from I've Got A Secret Plays What's My Line! | Buzzr

A SPOOKY SURPRISE from VINCENT PRICE! - What's My Line?| BUZZR

I've Got A Secret! - Arnold Palmer & Lauren Bacall 6/10/1963

I've Got A Secret - SHOCKING PREDICTION of next PRESIDENT by Orson Welles | BUZZR

Some trickery with Grace Kelly - What's My Line 1956 | Buzzr

Talented relatives of celebrities appear on "I've Got a Secret" (February 26, 1958)

I've Got A Secret - Philo Farnsworth, Buster Keaton 1957

What's My Line - A sad & heartfelt goodbye to Fred Allen | BUZZR

What's My Line? - Tom & Dick Smothers; PANEL: Steve Allen, Dina Merrill (Jan 29, 1967)

I've Got a Secret - May 6, 1959 with Jack Lemmon

I've Got A Secret - Featuring Peter Gabel, Jonathan Cerf and Kerry Kollmar! (Oct 15, 1958)

What's My Line 1955 With Salvation Army Band | Buzzr

I've Got A Secret! - Fred MacMurray 11/11/1959

The Beautiful Linda Darnell tries to stump the panel on What's My Line | Buzzr

I've Got A Secret (October 7, 1963) - James Garner

What's My Line? - Noel Coward; Robert Preston [panel] (Jan 12, 1964)

BLACK OUT ON SET! TUNE YOUR DIALS! - 1963 I've Got A Secret | BUZZR

I'VE GOT A SECRET: Guest Fred Allen; Art Carney [panel] (Apr 13, 1955)

What's My Line? - First-Recorded Synd. Episode (Sept. 9, 1968)

What's My Line? - James Stewart; Joseph Mankiewicz [panel] (Nov 10, 1963)

I've Got A Secret! - Dick Van Dyke 3/11/1963