I rather like this because it often seems that when one is dragged out to eat, for some reason or other, it is always the same poor person who is left to tot up the bill at the end of the meal.
At one meal I went to (some time back) some bright spark worked out that, nnn, should cover the cost and as quick as you like some of those present paid that and left whilst others, claiming that they'd had but the main course paid for that and also left. As the calculations started it was obvious that those who had legged had managed to do so without paying for drinks or (perhaps conveniently forgotten) sweets and starters!
The upshot was that some poor person paid sixty pounds over the top to cover (or to use the correct term 'Pardon') their debts.
Sadly this has been something I have seen (or been) on many occasions and so I find this little piece of doggerel both fitting and fun:
When going out I often find
A circumstance that blows my mind
The way that others munch and drink
Yet when cometh the bill
Well what d'ya think?
Leaving the smallest sum they can,
The leave the bill to just one man.
The hapless fool;
Who could it be?
You've probably guessed,
It's always me!
But now a promise I have made,
And Spongers you can be dismayed
For when the meal,
And drink, is done;
I'll pay my share
And then I'll run!
And you're the one who's left to meet,
The shortfall on the bill,
How sweet,
And to my joy and your dismay,
I have gone
And it's you who pay!