This is a humorous, true story. Way back, when I felt the need to pass gas while I was praying, I always felt awkward, slightly guilty, and apologetic, hoping that the Lord would understand. Then one day I heard a Father D (I've forgotten to spell his last name correctly) of San Francisco talk exactly about this situation (I didn't bring up the subject). He said that when that happens, all you do is stop praying momentarily, turn to the Devil, say "this is for you", do it and resume. This has worked beautifully for me. God does have a good solution to any of our problems, big or small.