The idea that there is a super-being constantly monitoring the firing of random neurons in every human brain waiting for the 'prayer in your head' pattern is patently ridiculous.
But, I suppose he doesn't really have anything else to do. He might as well monitor every thought in over 7 billion people (just in case they pray for God to send JW's to their door). So, probably best people don't hold hands while praying anyway - it really screws with the signal, you know.
PS: Who are all these JW's that get their panties in a bunch every time someone grows a beard or hugs someone in the kingdom hall? Why does the org cater to these people instead of telling them to grow the &*(! up? Oh right.. sex and friendship is bad.