just do it
If I were in your position, I'd just suck up the courage and do it. I would suggest going to a movie at a time and place where you don't expect a ton of people to be there. In one of the quieter scenes (or a really intense one, up to you), look over towards them. If you have your arm around them then kind of pull their shoulder towards you a bit. When they look over, just lean in and do it
You will probably have a bigger adrenaline rush then than you would literally skydiving, speaking from experience
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