Excluding shorts -- focus on Columbia feature length comedy films from the 30s and 40s.
Some that come to mind for me:
PLATINUM BLONDE
IT HAPPENED ONE NIGHT
TWENTIETH CENTURY
IF YOU COULD ONLY COOK
THE AWFUL TRUTH
TOO MANY HUSBANDS
HIS GIRL FRIDAY
MY SISTER EILEEN (granted, the Stooges have a cameo but blink and you miss it).
There's some others, like THEODORA GOES WILD and THE DOCTOR TAKES A WIFE, that I plan on seeing soon.
What are some of your favorites?