The video below was originally uploaded on November 18 in the channel of the RFSMediaOffice (Revolutionary Forces of Syria Media Office), a propaganda organization supporting various groups fighting the Syrian state.
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I do not know why the RFS Media Office would upload this. To show that the White Helmets and their videos are fake? Did they not pay their dues? Or was the channel hacked and the upload done by someone else?

The original title "Edge of death | #MannequinChallenge" points to some social media nonsense which The Telegraph describes as:

A viral video craze, it involves people imitating mannequins and freezing for the camera while music plays in the background.

So is this a fake? Or a fake of the fakes the original White Helmets videos are...?

Islamic State claimed responsibility for a suicide attack on a crowded Shi'ite mosque in Kabul on Monday that killed more than 30 people and wounded dozens in its third major attack on minority Shi'ites in the Afghan capital since July.

Officials said the attacker entered the Baqir-ul-Olum mosque shortly after midday as worshippers gathered for Arbaeen, a Shi'ite ritual marking the end of a 40-day mourning period for the 7th century death of Imam Hussein, grandson of the Prophet Mohammad.

A statement in Arabic from Islamic State's Amaq news agency said one of its fighters had targeted the mosque.

Bloody sectarian rivalry between Sunni and Shi'ite Muslims has been relatively rare in Afghanistan, a majority Sunni country, but the attack underlines the deadly new dimension that growing ethnic tension could bring to its decades-long conflict.

Fraidoon Obaidi, chief of the Kabul police Criminal Investigation Department, said at least 27 people were killed and 35 wounded, while the United Nations said at least 32 had been killed and more than 50 wounded, including many children. It described the attack as "an atrocity".

"I saw people screaming and covered in blood," one survivor told Afghanistan's Ariana Television, adding that around 40 dead and 80 wounded had been taken from the building before rescue services arrived at the scene.

Another witness said he had helped carry 30-35 bodies from the mosque.