The observer instantly changes you. You start doing other things just to look busy, as if you are doing meaningful things. Just a moment before you were doing meaningless things, now you are doing meaningful things.
The same was discovered in the innermost core of the atom: the electrons behave differently when there is no observer. And the moment the scientist and his instruments make them aware that somebody is observing, they change their rules; a sudden transformation takes place.
This was very shocking to the scientists because electrons are supposed to be particles of electricity, that's the meaning of electron. They are supposed to be material, but they are behaving with such great consciousness.