This came from my roommate’s textbook “Introduction to the Theory of Computation” by Michael Sipser-
“When the fifth symbol 1 is read, the fingers on q1 and q3 result in fingers on states q1, q2, q3, and q4, as you saw with the fourth symbol. The finger on state q2 is removed. The finger that was on q4 stays on q4. Now you have two fingers on q4, so remove one, because you only need to remember that q4 is a possible state at this point, not that it is possible for multiple reasons.”
It is like when your snoody cousin explains a game with the intention of watching your face squish in confusion.
Also this guy- http://www.youtube.com/watch?v=BdHK_r9RXTc