It definitely sounds like the engine has suffered some sort of internal failure here so a professional diagnosis is required. (mechanics.stackexchange.com)
We can try and take a guess to advise you here but at the end of the day if this noise is due to something more serious then just a noisy lifter etc earlier attention and repair is better than waiting for a possible internal failure to occur. (mechanics.stackexchange.com)
Well, that is an internal failure of the Catholic Church, not a failure with the Obama administration. (religion.blogs.cnn.com)