Black magic a.k.a Sihir is real and it is in accordance with the Shari'ah. The Prophet (saw) was at one point inflicted with Sihir by a Jewish man named Lubaid Ben Al-‘Aasim, which caused the Prophet (saw) to become very ill, through the Qur'an, the Prophet (saw) was able to heal himself.
Sihir can cause many afflictions:
-Dislike of one’s spouse, as indicated in the Qur’aan by the following verse (interpretation of the meaning): "And from these (angels) people learn that by which they cause separation between a man and his wife..." (Al-Baqarah, 2:102).
-Different attitude in the house from that which is outside the house. For example, a person will feel that he is missing his family when is outside the house but when he goes home, love changes quickly to extreme hatred.
-Inability to have sexual intercourse with one’s spouse.
-Frequent miscarriage for pregnant women.
-Sudden change in behavior without obvious reason.
-Complete loss of appetite for food.
-Thinking or imagining one has done something when in reality one has not.
-Sudden obedience and/or love for a particular person
As for curing this condition the following steps are recommended:
-Putting one’s trust in Allah with sincere belief that He is the only cure for everything.
-Reading Qur’aan and known supplications expressing seeking refuge, the most important and effective of which is sura 113 and 114, Al-Falaq and Al-Naas, which were used to cure the Prophet himself. Surah 112, Al-Ikhlaas, is recommended along with them, as well as the opening chapter of the Qur’aan, Al-Fatihah. To cure black magic some have successfully used seven lotus-tree leaves. The leaves should be crushed, then mixed them with water enough for taking a bath. The following verses from the Qur’aan are then recited: verse Al-Kursi (2:255), surah Al-Kafiroon (109), surah 112, 113, 114; the verses which mention magic, which are: in surah Al-Baqarah (2:102), Al-A’raaf (3:117-119), Yunus (10:79-82), and Taha (20:65-69). The possessed person drinks some of the water, and the rest is used to give him a bath.
-Removing the elements of magic as was done by the Prophet when he was struck by black magic by a Jewish man called Lubaid Ben Al-‘Aasim.
-Eating seven Aa’liya Al-Barniy dates (among the dates of Al-Madinah) first thing in the morning; if not possible, any dates will suffice, by the will of Allaah.
-Cupping--removing excess blood.
-Supplications
Source:
http://www.islamqa.com/index.php?ref=24 ... ck%20magic
there are crazy stories here in T.dot of females puttin' a spell on a certian fella...i hear there's this pakistani dude in scarborough who is black magic expert with a major xalimo cliental. 
So, please enough of your jokes.
