A photograph of a wheelie dated 1936! Wiki dates the stunt to 1943 when members of the U.S. Motorized Calvary were shown in Life magazine performing same, but this fellow has them beat by 7 years. One day my obit will read "found earlier photograph of a wheelie." Pretty cool! See the attentive fellow standing left with his bicycle? I think he's getting ideas. Enlarge the picture and you'll see a fellow holding on to the rear bumper.
"American Legion in Cleveland" anonymous press photograph, 1936 Collection Jim Linderman