Well aside from being muslims they're shias; with bizzare rituals of grief for their beloved immam Huseyn piss be on him; including patting own head; and self-abasements in ashura festival:
The Sick Celebration Of Ashoura Day by Muslims ~ This is NOT Red Paint!
Knowing your enemy takes on a new meaning when one sees how they celebrate a holiday called
Ashoura Day
Iraqi Muslim Shiites re-enacts the martyrdom death of Imam al-Hussein, grandson of Prophet Mohammed, during the Ashura ritual ceremony in Baghdad's poor neighborhood of Sadr City. More than a million Shiites, many beating their heads with knives, marked the mourning ceremony of Ashura amid heavy Iraqi security presence to prevent stampedes and attacks.(AFP/Ali al-Saadi)
An Iraqi Shi'ite devotee gashes his head with a knife during an Ashura ritual ceremony
Men wearing white shrouds and waving swords above their heads
Some slapped chains across their backs until their clothes were soaked with blood, while others beat their heads with the flat side of long swords and knives until blood ran freely in a ritual of grief.
Some sliced their foreheads with the edge of a sword in a practice known as "al-Tatbeer" — meaning "sword" in Arabic — and beat themselves while chanting "Haider, Haider," a name by which Hussein's father, Ali, is known.
"Although it is a sad day, I am very happy because I took part in these head-beating processions," said 10-year-old Haider Abbas Salim, whose face was covered in blood. "Imam Hussein's martyrdom teaches us manhood and that we shouldn't fear anything."
http://www.theodoresworld.net/archives/2006/02/the_sick_celebration_of_ashour.html