Corporate prayer is a very serious matter for white Christians. Children are taught from a young age to bow their heads, fold their hands, and close their eyes while praying. However, there is an equally important part of group prayer (particularly before a meal) that parents will not mention, but will certainly model for their children: the prayer voice.
In the same way that people change their inflection when talking to babies, white Christians assume that God also responds better to a certain vocal style. When praying out loud, white Christian fathers typically go up an octave and speak with slow, measured phrases to better please God's ears. Many different prayer voice styles are acceptable, but in no circumstance should a white Christian pray in the same voice that he uses for normal conversation.
White Christians also feel the need to use verbiage while praying that they would never use in everyday life. While they would never ask their fellow diner, "O Bill, we just come before you this evening and we ask thou to pass the butter," it seems like a perfectly reasonable thing to say while praying. As long as the person praying says these strange things in a quiet, reverent tone, the prayer will meet the approval of all.