system
surprised: A situation in which friends organize a birthday party for you when you did not expect them to do so. You walk in a dark room, turn on the light and all your friends jump out and say "happy birthday" and present you a cake.  
gpt
So the other day was my 23rd Birthday! I had no idea what my friends had planned but i walked into a room, a room which i thought was empty as the lights were all off, and all my friends jumped out and yelled happy birthday! It was such a shock, and felt so nice to have people who cared deeply about me provide me with such an experience! 
human
Must of been pretty surprised, Also great to have friends like that.
gpt
It really was! They even had my favorite kind of cake, chocolate mousse from my favorite bakery! 
human
That must of just made everything even better!
gpt
Right?! I mean who doesn't love cake. But that's not even the best part. on the counter, there was a HUGE pile of presents calling my name. 