Most ridiculous movie cast ever?

Cannonball Run, 1981.  Featuring, in alphabetical order: 

Jackie Chan

Sammy Davis, Jr. 

Dom DeLuise

Jamie Farr 

Farrah Fawcett

Peter Fonda 

Bianca Jagger 

Roger Moore

Burt Reynolds 

Also features Dave Mungenast, Sr. as "Kicked by Jackie Chan (uncredited)."