Good News Vs. Bad News

Jack phoned his wife Sally, who's at work. 

"Sorry, love," said Sally. "I'm up to my neck in work at the moment - I can't really talk."

"But I need to tell you something," said Jack. "I've got some good news and some bad news."

"OK, but I'm really short on time, so just say the good news."

"Well...OK then. The airbag works."