Is that question meant to be a joke? Ocean waves most definitely have external triggers.
The most common one is wind, but changes in atmospheric pressure can cause them, as can a sudden change in the sea floor due to an earthquake or volcano (this is what causes tsunamis). The rotation of the earth and the gravitational pull of the moon can cause waves when it moves water confined spaces - this kind of wave is usually called a tidal bore.
Is there some kind of ocean wave I'm unaware of that can spontaneously occur without some external force/trigger?
Is that question meant to be a joke? Ocean waves most definitely have external triggers.
The most common one is wind, but changes in atmospheric pressure can cause them, as can a sudden change in the sea floor due to an earthquake or volcano (this is what causes tsunamis). The rotation of the earth and the gravitational pull of the moon can cause waves when it moves water confined spaces - this kind of wave is usually called a tidal bore.
Is there some kind of ocean wave I'm unaware of that can spontaneously occur without some external force/trigger?