You know the drill from every nineties movie/tv show known to man, because apparently there were no doors in the nineties: you, oh poor you, are stuck up in your room, and then, a rock is thrown at your window! Why, who would do such a thing? No, it's not some kind of burglar coming in to steal all your...private room things, it's your childhood friend from next door (who totally has a crush on you/you're nursing a crush on), your free-spirited boyfriend or girlfriend, or another rebellious love interest who has a long, long ladder and no need for conventional entrances. Why are they here? To finally confess their secret feelings for you? Give you your first kiss? Sneak you away because your parents don't approve? Maybe they have a crappy home life and just need somewhere to stay.
Whatever the case may be, open those window panes and get ready for sneaking in, sneaking out, and possibly making out.