It's safer up the back....

[straitman]

And in fairness, to minimise the chance of bias, I would suggest that you need to swap who is sitting where so that you can both measure the difference. Sorry, straitman, but in the interest of improved research design....

Alternately I'd settle for swapping half way through the trip. That would really enhance the findings :!:

 

[JohnK]

Sounds fair to me. I will just have to consume my share of F champagne required for the fist half of the flight in the lounge prior to deparure.

 

[Keith009]

I'd happily volunteer for the control test - sipping champagne of a slightly lesser make in J, in the middle of the plane.