On a flight back from the good ol' USA last year my wife asked why it took 8 hours to get there but only 6.5 hours back.Was it by any chance because we were going downhill on the way back?
The bloke across the aisle burst out laughing.As did i.For ages.He then told his mate who also burst out laughing.
Sometime later,after i had explained about the gulf stream,the captain came over the tannoy and said something like...'for those of you who are asking the question about why it takes less time to fly from the US to Heathrow than it does the other way around...' and proceded to explain it all.
My wife was strangely quiet for the rest of the trip.