yes yes yes to the people who turn up with food without having discussed it first. DH's family all used to do this but thank GOD, MIL has learnt and bless her soul, is actually the most useul now as she'll have a chat with me in advance. On one memorable occassion, told me she wanted to buy the meat so just sent me some cash! We were both happy with this
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DH's habit of "tidying" up as we go.... and just dumping glasses and serving bowls on my (very limited) counter space so taht I'm now trying to make gravy around 3 champagne flutes, a crisp bowl and 3 mini bowls of dips.
I went to christmas one year where the host said she'd provide everything but everyone should provide their own drinks. No problem. We all turned up with suitably large amounts of wine on the asumption it will sort of get added to the table etc. One couple got very precious about THEIR (very expensive) bottle of red wine, refusing to allow anyone else to have so much as a sip.
Less "helpful" and more "just rude and irritating" are the ones who turn up completely empty handed. I have LONG accepted that no man in DH's family will ever ask if they can bring anything, or contribute in any meaningful way to Christmas and actually, it's fine. But I do find it a bit upsetting that it never crosses their mind to bring a bunch of flowers, a bottle of wine or frankly, a family sized packet of haribo to Christmas celebrations. I did laugh when his nephew brought his girlfriend for the first time - I got wine and a really sweet gift! haha.