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My fondest experience of being the only F passenger on NH, was "Moonwalking" down the aisle on a flight from NRT-LAX a few years ago.
The FAs were exceptional at serving me massive amounts of food and drink.
On one of many trips back from the bathroom, I looked around at the empty cabin and did a little shimmy.
Then I did a few dance moves.
Where's the disco ball when you need it?
Feeling invincible, I started Moonwalking down the aisle. My self-esteem was nowhere to be seen.
There I was dancing around around in a dark, empty F cabin.
Luckily, I settled down just before one of the FAs passed though the cabin and asked if I wanted another glass of Champagne.
I doubt she would have served me any more if she saw what I was up to...