When thinking about the speed of light, remember that gravity never waits. Light can be delayed by matter, but gravity propagates freely through spacetime.
Multiple sound waves including both harmonic and overtone waves, as well as the attack and decay which is the shape of the waves individually and in aggregate.
Cause and effect feel certain because experience trains us to expect patterns. Hume pointed out that just because something always happens in our experience doesn’t mean it must happen.