Have any guys ever came (ejaculate) on themselves in public?

Im 22 and I was in the bathtub and suddenly semen came out without me touching my penis or doing anything. I have had nocturnal emissions before but this daytime thing is relatively new to me. I also noticed that it was not as much semen as night time meaning more comes out at night. Is it possible that it may gush out or squirt out hard during the daytime? Im worried this may happen in a poblic place and it might drip down my pants and everyone would see. Has anyone ever had that happen to them? Have you ever came (ejaculated) in public and get embarresed or have you ever seen this happen to someone? Im just curious.