I guess one of my my most embarassing moments was our house-warming party. We had invited several neighbours, whom we didn't really know at all well at that stage, as well as lots of friends to join us "around mid-day" - never expecting anyone to turn up until at least 1.00 pm ... or even 2.00 pm; but, no, these a country people and if they are told noon, then noon it is. I knew a couple did not drink alcohol, so I had bought all the usual culprits for them, orange juice, lemonade, coca cola, etc.
We were not quite prepared when they started arriving and I was in such a flap I asked one of our friends to look after drinks. She came up to me to ask for drinks for the non-boozers and I forgot all about my vast store of appropriate drinks and said "... just give them water." Not a very gracious hostess at all - I forgot all about this until the next day when I saw all the oj, lemonade, etc. sitting, unopened, in the larder. I am sure (or I hope) that they have forgotten, but I still cringe to this day when I think about that.