Going to the Science channel and realizing that their target audience is even dumber than average, because people only watch it to look smart...
Also, when the Mythbusters forget that 5 minutes of math is much faster than weeks of experiments and arbitrary explosions, or when they forget a crucial detail of a myth and assume it is busted, I.E. a car skipping across water. They see a Lamborghini Countach skip across a pond, they replicate it with a slightly modified coupe, it works perfectly! Yet, it is busted because they had to change the weight distribution for the FRONT-ENGINED coupe to be more even, when the car in the myth was a Lamborghini which happened to be REAR-ENGINED.
Also, I saw some show on the Military Channel about some combat vans built junkyard wars-style, and they waste so much time working on a stupid cleaver when they already have a machine gun on there! Not only that, but they could easily find out that it was too heavy for the piston to move quickly. Find the weight of it, find a good target speed, multiply psi of piston by area of piston head, and divide by the weight of the cleaver. That will give acceleration in G.
now, plug in the result into this:
(Seconds)=[9.8(Meters/Second)(G-forces from earlier conclusion)]^2-(Distance in circumference to target)
Take those seconds, and put it into this:
(Quantity of Seconds from last equation)[9.8(m/s)*(G)]^2=Speed in M/S