+3
Here are some short films I've since since sharing this list which would've either been in contention or would've made it. I bolded a few of my favorites. I was surprised I hadn't seen Ballet mécanique, Entr'acte, and Fireworks at the time I posted this list.
A Photographic Contortion (The Big Swallow) (1901)
Anemic Cinema (1926)
Ballet mécanique (1924)
Blow Job (1964)
The Consequences of Feminism (1906)
Dream Work (2001)
Dyketactics (1974)
Entr'acte (1924)
The Finishing Line (1977)
Fireworks (1947)
Franz Kafka's A Country Doctor (2007)
Gena the Crocodile (1969)
I Like Life a Lot (1977)
Instructions for a Light and Sound Machine (2005)
It Has to Be Lived Once and Dreamed Twice (2019)
Light is Waiting (2007)
Léon G. Damas (1994)
The Man With the Rubber Head (1901)
The Mascot (1933)
The Mask (2023)
Motion Painting No. 1 (1947)
Mr. Dough and the Egg Princess (2010)
The Physics of Sorrow (2019)
Pièce touchée (1989)
Sissy-Boy Slap-Party (2004)
The Stolen Heart (1934)
Szél (1996)
Trees of Syntax, Leaves of Axis (2009)
Weather Diary 3 (1988)
The Woolworths Choir of 1979 (2012)
Yum, Yum, Yum! A Taste of the Cajun and Creole Cooking of Louisiana (1990)