<human>: This actually happened a few years ago, but i though i'd share it anyways:

I came home from a three day bike trip, got in the shower, and after that sat on my couch wearing nothing but my boxers. While I was watching a game, i heard my girlfriend take a shower and she got out of the bathroom naked just in the moment the first half of the game was over. 

I always jokingly had said that one day i would lock her out on the balcony naked, and since it was a pretty warm day, i saw the opportunity to give her a little scare. So i grabbed her, and started carrying her across our apartment towards the balcony.

Being the brilliant evil mastermind that i am, i then saw the front door to our apartment and thought: "locking her out in the hallway would startle her even more!!!", since its a hallway and staircase that our apartment shares with about 14 others. 

So i carried her over there, opened our front door, and put her down in the center of the hallway. Her being completely naked, me still wearing only my boxers. And that was the moment when i heard our door fall shut behind us. A door that from the outside can only be open with a key.

Can you summarize the given text in a few sentences?
<bot>: Wanted to give my gf a little scare, ended up with me almost and her completely naked outside of our apartment.