Following is what I find on wikipedia:
Examples of vandalism include salting lawns, cutting trees without permission, egg throwing, breaking windows, arson, spraying paint on others' properties, tagging, placing glue into locks, tire slashing, keying (scratching) paint, ransacking a property, and flooding a house by clogging a sink and leaving the water running.
I think insurence company just want to use execuse to say my cause is not covered under policy. It has category that cover vendalism and malicious mischief.
Thanks!