The Reason You Just Got Slapped...

is because you premise a story with FAKE horrible news, only to tell me the really good news.

Example:

Dumbass: I have herpes.
Unfortunate Girlfriend: WHAAAAAAAA? Oh, no. WHAT DID YOU DO TO MY VA-JAY-JAY?
Dumbass: Just kidding! Will you marry me?

I really don't know who thought it would be a good idea to make someone depressed before you tell them good news, but whoever it was, is a fartbucket. Extreme lows before extreme highs only work in certain situations, like when you are trying to make something really bad sound better:

Boyfriend: Sarah Palin is President.
Girlfriend: Nooooooooooooooooooooooooooooooooo!
Boyfriend: JK. I have herpes.
Girlfriend: Phew.

Word.