I was about to go on maternity leave and my coworkers threw me a baby shower at work. I had no idea they were planning it.
I was about to go on maternity leave when my coworkers threw me a baby shower. 
user
Hey that's great of them!!  Did you get anything cool?
assistant
I got lots of cool stuff and I had no idea they were planning it!
user
That's fantastic!  What an awesome day, huh?
assistant