Hold your breath. Keep holding it until you think you can't hold it any longer, then continue holding anyway.
No, you can't pass out. Your body won't let that happen. No matter how you might try, your body will eventually make you take a breath. When it does, hiccups should be gone.
It always works for me. No prescription necessary.
I'm not here for friends. I'm here for the truth to the best of my knowledge of it, even if it's not what people want to hear.