Mischief can be a fun thing. It can also be a bad thing.
Making a little mischief as long as it isn't hurting anyone in any way is fun and okay in my book. It's when it goes to the harmful route it's not a good thing.
Be careful with your mischief and have fun folks.
P.S. This is not a bad attempt of anything in light of the Boston Marathon. Just my M catch up.