She could have been expecting one or the other, thus making the occurrence of both a surprise.

Well, the first surprise precipitates the second, so since it's a consequential relationship, I think it could be argued that it's a single event, and thus really one surprise.

I was watching this exact scene when I clicked on POETV, it was a pretty good time.

What's critical here is the semicolon. Without a semicolon, there's no implied connection between the independent clauses. Watch:

"This school girl is in for a surprise. She's going to get a face full of jizz and she's going to like it. Then, CUPCAKES!"