I have always believed in theory about parallel universes. We all know that the human eyes are capable of seeing colors between a certain frequency band. similarly we've also learnt that hear sounds only within a certain frequency band whereas other animals can see and hear colors and sounds even beyond these frequencies. Now this must be true for all our senses - sight, smell, taste, sound and touch. This means that we are experiencing a part of the universe around us while there definitely exists another part which we do not experience and just because we do not experience it does not mean that it does not exist! so we could say that we exist in the 'world' which we experience and there exists one or more other 'world' which we cannot experience and are not aware of! So now the question is, is it possible that there is an entire universe existing parallely with our universe which we are not aware of, which is beyond our experience? and is it possible that the creatures in those universe may or may not be aware of our existence? It might be possible that it is they who are controlling us or using us for their needs. We have devices which are able to measure signals and transmissions beyond those of human perception but just like the limitations of our sense organs i believe these instruments would also have a limitations. It is also possible that what you buy for your daily needs from the shop near you are actually the wastes discarded by the creatures from parallel universe :). Imagine that our day to day activities are the source of entertainment for these creatures, a sort of reality show for those beings. Oh God! I feel that I am getting out of this universe and have hacked into the the 'System' of the parallel universe :).
Imagine, there must be another 'being' sitting here next to me and smiling at these conclusions that i am arriving at and another one sitting next to you reading this with you :-).