When Ciro Santilli was studying electronics at the University of São Paulo, the courses, which were heavily inspired from the USA 50's were obsessed by this one! Thinking about it, it is kind of a cool thing though.
Video 1. Tutorial on LC resonant circuits by w2aew (2012) Source.
Video 2. LC circuit dampened oscillations on an oscilloscope by Queuerious Guy (2014) Source. Finally a video that shows the oscillations without a driving AC source. The dude just move wires around on his breadboard manually, first charging the capacitor and then closing the LC circuit, and is able to see damped oscillations on the oscilloscope.
Video 3. Introduction to LC Oscillators by USAF (1974) Source.
Video 4. LC circuit by Eugene Khutoryansky (2016) Source. Exactly what you would expect from an Eugene Khutoryansky video. The key insight is that the inductor resists to changes in current. So when current is zero, it slows down the current. And when current is high, it tries to keep it going, which recharges the other side of the capacitor.
In the LC circuit:
You can kickstart motion in either of those systems in two ways: