"A well-behaved boyfriend should always sample his girlfriend's opinion at no less than twice the frequency at which she changes her mind. When the sampling frequency is too low, a boyfriend soon experiences the effects of aliasing... with probability at least one half, he misinterprets her mind." -Allen Miu
Here's a high level overview of the original Nyquist-Shannon sampling theorem.
"Often times, especially for the husband-wife situation, direct sampling is not possible and the sampling rule is violated. In this case, husbands---and others who face husband-like issues---must resort to advanced learning, state estimation, and feedback-control techniques of which the details are difficult to explain and are beyond the scope of this exposition." -Allen Miu