What's the most absurb advice you've received in the old car hobby?

[40 Deluxe]

So many; where to start? How about: "Check the timing first thing if it won't start". (Tell me, how does the timing suddenly get so far off that it won't even start??) Or, a common one: "You need that there zinc additive"!! Or: "You have to use non-detergent oil"!! Next: "You have to pull the car to start a freshly rebuilt engine"! (Like that poor mis-led guy on Haggerty.)