Slightly off-topic, but I had to laugh at one I got last year.
I had decided not to bother sending to one university friend, since we had no contact except via Christmas cards and she hadn't sent one the previous year. Much to my surprise, I got a card from her - I recognised her handwriting immediately. However, when I opened it, I realised why I was being honoured this year.
This friend lives in my hometown with her fiance of several years (one of many reasons we don't speak - she never forgave me for getting married first). Inside the card read "Here's my new address!"
Let me add at this point that when she first introduced me to her fiance she said "This is X, he'll be earning 50K a year soon." This is her mindset.
The new address was in one of the wealthiest areas of our hometown.
In other words, "Look where I live! Impressed yet?"
I sent a card back, but also looked up her address on Google Earth. In an area full of cathedral-sized houses, it was a very small and run-down semi, but in the spirit of Christmas I remained dutifully impressed.