Richie sang the theme to “Blueberry Hill” several times during the series as I remember (whenever he met a hot girl.) It was his expected reaction.
Yep, I remember just one scene. But yeah, there were others....
https://www.google.com/search?num=100&safe=off&q=richie+cunningham+i+found+my+thrill&oq=richie+cunningham+i+fou&gs_l=psy-ab.1.0.0.1998.4473.0.6916.8.8.0.0.0.0.338.1322.2-4j1.5.0....0...1.1.64.psy-ab..3.5.1312...0i22i30k1.0.0vqvA5uD-cE