Things that make you go hmm.
How come flight attendants have to pick up the cups they serve drinks in prior to takeoff, but they let me keep the Starbucks coffee I brought on board myself?
If Delta, United, and American award points as a multiple of the price paid for your ticket, why do they call those points ‘miles’?
If liquids are so dangerous, why are they tossed together in a bin next to the security checkpoint instead of dealt with by a hazmat team?

Why don’t airlines who base elite status on revenue give credit for tickets purchased but not flown?
Why do rental car companies have to cable ALL of a vehicles keys together? If you lose one key this way you lose them all. Whose pocket exactly are these supposed to fit in?

I might as well add, echoing Gallagher, “why do we drive on parkways, and park in driveways?”