It’s just a Myth.
That show was one of the best examples of how science and engineering actually work. Start with a premise or question. Decide what principles, equations, can be tested. Determine the variables that will affect the data and if the results will be valid. Determine how success or failure will be measured. When those points are decided THEN run the test. Repeat the test to verify consistent results.
My one problem with the show was the constant repeating and catching up after every commercial break. You knew the break was coming when the countdown began.