['Hi!  I planned a get together at my house and was surprised.', 'What happened?  Do tell :)', "I could only think of 5 people to invite, and was worried they wouldn't even come. But then...", 'Well.. I guess I will never know...', 'I was surprised because 15 people showed up and it turned out like a party!']
Oh Snap!  wow... That was a surprise!
I invited some people to my house for a get together and didn't think that many people would come.  In fact, I could only initially think of 5 people to invite.  The night came, and so did more than 15 people.  I was surprise at the turn out.