Training rides to be afraid of:

on your way out, you find that you are much stronger than usual because your speed is several MPH faster than normal. You feel good so you decide to head out bit further than normal.

then you reach the turnaround point. Turn around and WHAM the headwind hits you HARD!! You also realize your home is further away than usual.

It took me several years to be wary when it seemed so much easier on the way out because of the tailwind. Now if I get into this situation, I turnaround before my regular turnaround point.

And yes I too have been passed by an old GEEZER!! Greybeard was riding a full suspension mountain bike with full on knobby tire making that roaring sound. I was riding my racing bike doing close to 24MPH. This was back in the days... Maybe he was doping