It seems that churches and choirs can provoke much merriment - for instance 'The vicar of Dibley' and other such TV programmes.

Here is just a selection.....

 gaffes and blunders 1  gaffes and blunders 2
 gaffes and blunders 3 gaffes and blunders 4
happy clappy
confession
upfront
choir rules
no excuses