Especially when John Lydon showed his jovial side while being interviewed by Dick Clark and when he decided to invite all the Bandstand kids back up to the dance/stage space for the band's second song. One of the best music TV moments in American TV history.
Some other unconventional "American Bandstand" musical guests, this time from the show's 1960s incarnation — Captain Beefheart (via telephone interview with Don Van Vliet and an unlikely-looking young female fan who continues talking to him happily while the "Bandstand" kids dance to "Diddy Wah Diddy") and, in one of their first appearances on American television, Pink Floyd with Syd Barrett still in the band, back when they were still playing esoteric psychedelic rock. Dick Clark had his finger on the pulse of the FUTURE of music back then!
When Dick Clark said in an interview that he would never join the A.A.R.P. because he never wanted to lose touch of "the kids". One got the feeling that if he could've done so, he would've kept "Bandstand" going until he couldn't stand anymore.
The time Madonna made her first appearance on the show; it was her first appearance on national television and she was already full of confidence. When Dick Clark asked her in the post-performance interview what her plans were for the future, she confidently said, "To rule the world."
The "Bandstand" kids of the late 1970s managed to invent a dance that is still danced to this day at wedding receptions and other such gatherings; they pioneered the moves that everybody does when dancing to the Village People's "YMCA".