Campbell's First Law
Whatever the science, the forces of nature will exploit any loophole in experimental or theoretical design and construction, any ambiguity in measurement and any unchecked or unrecognised assumption to lead a researcher to enticing but false conclusions.
Campbell's Second Law
Scientists are as vigorous in complaining about the incomprehensibility of others' scientific papers as they are lazy in clarifying their own.
Campbell's Third Law
The probability that a Powerpoint presentation will fail is proportional to the technical sophistication of the institution at which you are presenting it. (And by the way, where the failure is total, your talk will be all the better for it.)