A man frantically calls 911 and says, “Help…my wife has gone into labor and her contractions are 10 minutes apart”.

The 911 operator asks, “is this her first child?”

To which the man replies, “Of course not, you idiot…this is her husband.”

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Another version of this joke:

Dispatcher:  9-1-1 What’s  the nature of your emergency?
Caller: My wife is pregnant and her contractions are only two minutes apart.
Dispatcher:  Is this her first child?
Caller:  No, you idiot!  This is her husband!