A Halloween mask depicting US President Barack Obama is displayed at a store in Silver Spring, Maryland, on October 28, 2010. Halloween, an ancient Celtic pagan rite, originally held to celebrate the dead and the end of the harvest season, is primarily a childrens event, it also gives adults an excuse to dress up like their favorite ghoul and behave like kids. People carve pumpkins into frightening or comical faces and place them on their doorsteps after dark during Halloween which is celebrated on October 31 every year.(AFP)