Like the infinite monkeys typing Shakespeare, but with audio instead.
If there was a program that created a series of sounds at random intervals, pitches, amplitudes, etc., how long would it take to produce an output that sounds like music, some sort of recognisable recording (e.g. a bell ring, a dog barking), or perhaps even a human voice?
Music probably wouldn’t take long. There are all sorts of everyday sounds that mesh together into little melodies.
Honorable mention in particular: Short snippets of white noise sound like a snare drum.
Low fidelity mumbled speech sounds a lot like radio static if your ears are tired enough too
Back when I would stay up too late playing World of Warcraft, my computer fan would occasionally speak to me.