Sinister Pumpkin (series)

The Sinisters are a set of three pumpkin hats released at Halloween in 2009, 2010, and 2011. Each hat is named "Sinister" followed by a letter, and the descriptions say they are family. Each pumpkin has a grinning face with two bared teeth.

Sinister P.
The first Sinister released, Sinister P. has the colors of a real pumpkin. You could win it in a halloween contest in 2009 by finding it in a game called ROBLOX Halloween Treasure Hunt.

Sinister S
Sinister S was created on October 29, 2010 and was put on sale for 250 R$ (not definite). The description identifies him as Sinister P's pale brother. It is no longer on sale.

Sinister T
Sinister T is the third hat of the set and was on sale during Halloween 2011. Price before going off sale unknown.