You can yell fire in a crowded theater if there is a fire. Joking about a bomb in your luggage is not the same as having a bomb in your luggage. Same for a stickup note versus a real stickup. The guy is a dumb ass, but why charge him with criminal attempt of robbery by intimidation?
Ok, so you think the guy is just a dumba...?
First, is that what you role model and teach young children? Frighten people needlessly? Call police as a joke?
Second, not send him to jail? Ok, how about you fine him for all the law enforcement we needed to send on this joke and my tax dollars paid for? If this jerk wants to play a practical joke on his family or friends..go for it. But when you involve the community you can go to jail.
Final question...what other kinds of "jokes" does he do with these 13 yr old girls?