Motivated by greed and malice, goblins can't help but celebrate the few times they have the upper hand. They dance, caper with sheer joy when victory is theirs. Once their revels have ended, goblins delight in the torment of other creatures and embrace all manner of wickedness.
Goblins occupy an uneasy place in a dangerous world, and they react by lashing out at any creatures they believe they can bully. Cunning in battle and cruel in victory, goblins are fawning and servile in defeat, just as in their own society lower casts must scrape before those of greater status and as goblin tribes bow before other goblinoids.