Goblins Just Wanna Have Fun

From the introduction:

Goblins can be evil beings, who want to avoid direct combat with those who are in advantage, or are apparently stronger than them. Pranks and mind tricks are always better than direct contact. Also, unsuspecting adventurers are always a good source of fun in the dull dungeon we call life. I know this may sound a little macabre, tasteless pranks that can lead to death. But hey, we're talking about evil Goblins.