Increase in Bomb Threats

I've noticed that bomb threats are increasing in today's society. When I was in high school, we would always have about 2-3 bomb threats every spring, supposedly by students who wanted to get out early. Though I don't know the reason for an airline bomb threat... maybe somebody wanted to get off the flight... it is rather strange why threats are increasing. Any more ideas as to why?

it could be the number 1 reason behind vandalism... boredom

True... true.