Nyquist is a little confusing. For example, if you sample a sinusoid at just a little more than twice its frequency, you're going to get just two points of the complete sinewave. Now, you CAN reconstruct that sinewave from just those two points, but it involves a bit of math (filtering). What, exactly, are you trying to do?
For example, if you take those two points and plot them on graph, it's not going to look anything like a sinewave; it's going to look like two points.