English is a punny language

It's morning time, 8:28AM, in Mumbai. Ive reached office, and now am going through my mail box. Following is the joke someone felt would make me laugh...

A man enters the plane and shouts: HIJACK!!
People all around are really stunned to hear this.
Great panic follows...
People are really scared and nervous...
Then a guy from rare end says: HI JOHN!

Laugh, I did, but for another reason: I found it funny that Jack spoke HI JOHN from his rare end! Amazingly punny, isn't it!