Dan O'Keefe, who worked with Schaffer on
Seinfeld, credits Schaffer with introducing the concept of the
Festivus pole as the only decoration for
Festivus, the December 23 holiday. Festivus was popularized in the 1997
Seinfeld episode
"The Strike". The aluminum pole was not part of the original O'Keefe family celebration, which centered on putting a clock in a bag and nailing it to a wall. ==Personal life==