Funny thread....but...interestingly, I was just watching some stuff about the memory of water and how water can take on different shapes under the stimulation of sound. I suppose if you remove the human consciousness aspect from the interpretation, it might be possible that the water in the plant is "responding" to the frequencies of other vibrations around it?
I do believe there are forces in nature that humans cannot fathom. After all, plant life has been an Earthling a lot longer than humans have. I don't think it's completely out of the question that plants figured out ways to "communicate" (for lack of a better term) with other creatures on some level because just look at the care we have come to give the plant when growing it. We grow it for the "reward" that awaits us at the end. It seems to be able to produce chemicals that cause us to like it so much that, for generations, people were willing to risk going to prison to grow it.
People don't yet know everything about everything. I believe it IS possible that plants can communicate with some people on some level.