- Country: UK
- Genres: Comedy
- Release: 1964-05-10
- Director: Don Chaffey
- Writers: Donald Taylor , C.E. Vulliamy , Robert Hamer
- Language: English
- Stars: Leo McKern (1920–2002) , Janet Munro , Maxine Audley , Dennis Price , Miles Malleson , Mervyn Johns , Patricia Jessel (1920–1968) , Duncan Macrae , George Benson , Ralph Michael
- Runtime: 94 min
- Awards: N/A
- AKA: Eine schreckliche Entdeckung , A Jolly Bad Fellow , They All Died Laughing (United States of America) , A Jolly Bad Fellow (United Kingdom) , Kollege stirbt gleich , O Assassino Genial (Portugal, Portuguese Republic) , I giftigaste laget (Sweden)
- Plot: An English professor decides that there are too many useless people in the world and invents a gas that will kill them off. But first they'll at least have a good laugh.
- IMDB:tt0058248
They All Died Laughing Cast · · · ALL
Don Chaffey
Director
Leo McKern
(1920–2002)
Professor Kerris Bowles-Ottery
Janet Munro
Delia Brooks
Maxine Audley
Clarinda Bowles-Ottery
Dennis Price
Dr. John Hughes
Miles Malleson
Dr. Woolley
Mervyn Johns
Willie Pugh-Smith
Leonard Rossiter
(1926–1984)
Dr. Fisher
Jennifer White
TV Make-Up Girl
Patricia Jessel
(1920–1968)
Mrs. Pugh-Smith
Duncan Macrae
Dr. Brass
George Benson
Inspector Butts
Ralph Michael
Superintendent Rastleigh
Alan Wheatley
Epicene
Wally Patch
Tom Pike
Mark Dignam
The Master
Jerome Willis
Detective Inspector Armstrong
John Sharp
Hodges
Lloyd Pearson
Dr. Rossiter