Just for fun, put rain-X just on the drivers side of the windscreen.  Drives
the passenger nuts.  They also make Fog-X which works fairly well on
interior glass.  Then there's Head-On.

If the tire is under inflated, does the wheel make more revolutions per
mile?  Less?  The same?  Why?

John, where do you buy that pucker sucker?  I asked my FLAPS Dude and he
almost choked.  Tearily guffawed that he thought it was a great idea.
Probably the same with the prop wash, fallopian tubing, and catalytic
converter belt.

Wynn's Friction Proofing comes to mind.

Motor Honey?  Plating metal with PTFE?

We do need a better education system in the land of the free, or almost
free.