A couple of fun rules I made up not so long ago. 
I don't believe in fairies!
Whenever the Sprite character is about to lose a life, any player, aside from the one who plays as the Sprite, may shout "I don't believe in fairies!". If they do, the player of the Sprite must immediately roll a die. On a '1', the Sprite will lose an additional life. However, any player who does so must immediately ditch the Pixie follower, and from then on, whenever they encounter the Fairy or Luck Fairy they will immediately be turned into a toad.
I do believe in fairies!
Any player, aside from the one who plays as the Sprite, may at any time shout "I do believe in fairies!". I they do, the player of the Sprite must immediately roll a die. On a '6', the Sprite will gain a life. Any player who shout "I do believe in fairies!" but had previously shouted "I don't believe in fairies!" will no longer suffer the effects of being a player who shouted "I don't believe in fairies!".
What do you think? 