hijack

Emann was at the airport when he saw a friend looking like he'd just been beaten up.
Concerned, he asked him what had happened.
Looking dazed, his friend said, "I really don't know. When I boarded the plane, I saw a friend and greeted him. Before I knew it, the airline security jumped on me."
Emann said, "Really? What did you say to your friend?"
His friend answered, "All I said was, 'Hi, Jack!'"
木久扇並みのジョークでした。