Remember that loud piece of rap music that was blasting when Alsa came home to catch Karen having it off with "Duggie" on her loungeroom floor in early 1993?
The aforementioned track was playing in the Diner in today's episode (1641) when Alf asked Jack about what Curtis was getting up to, finding it hard to believe that he would be studying off his own bat, and that really he is mucking around with Cloe. The scene ends with Duncan having an accident in the kitchen (sound of smashing glass).
The song seems to have "Angels" in its lyrics.