Thanksgiving hat

Thanksgiving hat is the most expensive rare item in RuneScape. This item was obtained in 2001 by RuneScape players who attacked chickens on Thanksgiving. The hats were common and there are only 34 left in RuneScape, of which 12 are held by a player named Java32.

The thanksgiving hat was the first ever Thanksgiving item and was the most powerful. If you right-click it and press "Cook-Turkey", it allows you to cook chicken which would gradually recover your health 4x faster. This is an advantage for bosses and Fight Caves/Fight Kiln.

There's another chance to obtain one (very rare) from Giant Turkeys (level 138) in Thanksgiving 2012.