Here you go. If you watch the whole thing, looks like he's doing impressions or something to make his friends/filmers laugh. An investigation of all the links below make it pretty obvious he and his brothers are Chechens and adhere to some sort of version of Islam...specifically the one that also endorses blowing shit up while wearing designer duds, making youtube videos and listening to dance music headline by women in bikinis.
I really don't know what to say, except these guys were too young to posses brains so horribly washed or polluted that they would commit the act they did.
Dhojar Tsarnaev
His VK: http://vk.com/... ('gift's' are bombs and bricks)
Tamerlan Tsarnaev's youtube page: http://www.youtube.com/...
(an unfortunate mix of religious things and scanty-clad female dance tracks)