Munchkin Adventure Time: Spot the Snail
 

So this could potentially apply to any "Play Immediately When Drawn" card, but I've only had this dispute in regards to the Spot the Snail card:

If you get the card in a situation where you didn't actually *draw* the card (i.e. in your starting hand, during charity at the end of a level 9 player's turn, etc.) Do you get to hang on to it until you spot a snail that you can play the card with?

Re: Munchkin Adventure Time: Spot the Snail
 

If you get it in your starting hand, you may wait to play it until the game is actually underway (the first player has started her turn). Otherwise, you should never receive it as Charity because whoever had it first should already have played it.