system
surprised: It was my 40th birthday and my coworkers threw me a party. I had no idea!
human
It was my 40th birthday and my coworkers threw me a party. I had no idea!
human
That is awesome that you have such friendly coworkers!
human
I do. I was so surprised they did something so nice for me. 
human
Make sure you give each of them a thank you card