HBO randomly played this the other nite

I couldnt believe it. Havent seen this movie in over 20 years, I come home from work the other nite and it was just coming on HBOWEST or something like that. Where did they dust this gem off from? My sister and I used to watch it on HBO wayy back in like 1980 at my Granmothers house. It seemed so fresh yet I knew all the lines and scenes from it after all these years. thanks HBO. They just randomly played it.