Question about Orthodox Judaism

In reference to the scene where Larry is stuck up on a ski lift with the unmarried Orthodox girl, she tells him that if they are still together after sundown, it will be against a law of Judaism mentioned in the Torah. She asks Larry to jump, at which point he steps completely out of his Orthodox Jewish accent and says, "What, are you *beep* nuts?"

Since he won't do the sensible thing of jumping and risking his life and limb, the girl winds up jumping, allowing Larry to continue dining on a meal of edible panties while realizing that poor Richard Lewis won't be getting a kidney after all.

So my question is this, in a similar situation in real life and she couldn't jump or escape in any other way, what would be the consequences? Say the ski lift was three miles up or directly over rocks or a spiked fence or perhaps the couple was stuck in an elevator? What would be the result for the unfortunate single girl? Would she be shunned by her family and the Orthodox community? Or was this law exaggerated for comedic effect?