Seconds
director John Frankenheimer, 1966

The gimmick here is, Saul shot moving reflections distorted in a Mylar flexible mirror and used those as backgrounds for his titles.
The stuff is still around; I used to have some of it myself.
Obtainable from Edmund Scientific - an old-reliable company well worth a visit

The same stuff was used by photographer Ira Cohen for his From the Mylar Chamber pictures, which I saw in Avant Garde magazine long before I actually met the guy - on a 1982 New York exhibition of Cibachrome prints
(made by Ira Landgarten).