The moment Han Solo realized he was going to marry Leia Organa was when she decided she was going to stop blaster bolts with her mind. It wasn't that decision that sparked it, but more his reaction to it (which mostly consisted of immediate acceptance and looking around for some safety gear). It had all worked out for him, though, because when an assassin invaded their wedding two years later, Leia just rolled her eyes and flicked her hand at the blaster bolt, which stopped in mid-air.