Banana Peel
This item could be obtrained from the drop system. It was released a couple of days before the Pyromania Update in June 2012. After the update, the Banana Peel was incinerated and renamed to 'Burned Banana Peel', thus becoming a crafting ingredient for a 'Pile of Ash'.
Banana Peel
Team Fortress 2 Level 1 Banana Peel
Where did the banana go? Sit down for this next part, because WE HAVE NO IDEA. Admit it, that's kind of mysterious.