I like the Water Form.
'2 Hordes were swimming in Alliance waters. A Alliance druid spots the horde and decides to play a prank on them. So, the druid had transformed in Shark Form and lurking towards the 2 hordes. The Goblin spots the shark and tries to get away but drowns. The tauren starts swimming away and tries to reach the land but then the druid had caught the tauren in the foot. The tauren screams and then justs faints away. The druid is like WTF!?!'