No Wonder I Couldn't Find This ....
I saw this on ShowTime® in the late 70s.
I was called "The Deltas".
They even have a fancy & clever animated graphic in the trailer saying "The Deltas".
And as far as a calling this a "comedy" goes, I thought it was a
taut, suspenseful psychological thriller.
Eh ...
Guess that's why I watch movies & not make 'em.
B .... I .... L-L-T .... E-T-L-E-YYYYYYY Bill Tetley!