Even though I've actually owned it for years now
I think I picked it up in the bargain bin at Walmart some years back , just have never gotten around to actually watching it....................lol
I did see both Thank God Its Friday and A Fish That Saved Pittsburgh in the theatre when I was a kid though
Thank God Its Friday kind of surprised me because I thought I was in High School at the time , it came out in 1978 so I must have been in Jr High
But I do remember my friend David and I went to see it in the afternoon of a school day , we were close to being like the only ones in the theatre , I don't think we were playing hooky , I think it was one of those teacher in service days