Social convention dictates that you must offer your dining companion some wine before pouring any for yourself. If you’re channeling your inner greedy glutton, this is the moment when some intelligent use of language comes in handy.
Lifting the bottle, with a friendly tone and look of sincerity you say the words:
“You don’t want the last glass of wine, do you?”
Almost without fail, your dining partner will decline.
The trick here is that you’re planting a thought – you don’t want the last glass of wine – into your friend’s mind, then following up as if it was a question.
Thus, with social convention observed, you are left to enjoy your bounty.