Alphonse and Gaston
or Al·phonse-and-Gas·ton
adjective
marked by a ritualistic courtliness in which two often competing participants graciously but stubbornly defer to each other: a kind of Alphonse and Gaston act in which each man insisted the other go through the doorway first.
Origin of Alphonse and Gaston
after the title characters of a cartoon strip by American cartoonist Frederick Burr Opper (1857–1937), which first appeared in 1905