Mischiefs

noun

1. Conduct that playfully causes petty annoyance.

   "Drink led to mischief."

2. A playfully annoying action.

   "John's mischief, tying his shoelaces together, irked George at first."

3. (collective) A group or a pack of rats.
4. Harm or injury:
5. A cause or agent of annoyance, harm or injury, especially a person who causes mischief.