So, my husband has a friend, and wanted to send a gift to this friend and his fiancee for Christmas. But the particular gift he wanted to send required some explanation. So he picked out the gift online, wrote a note on it, "Don't open until you read the letter first!" or something like that, and sent it. He then wrote a letter, wrote on the letter, "Wait until the box arrives, then read this letter first!" and then sent it.
However, a crazy mix-up occurred. The box arrived before the letter, but, coincidentally, at the same time as a letter from the friend's aunt. So the friend assumed that the box went with the letter from the aunt (even though our name/address were on the box, they missed this somehow while still seeing the "open letter first" part). So they opened the letter and read it, even though it didn't refer to the box at all, then opened the box and assumed it was from the aunt.
The funniest part to me? They then sent a thank-you note to the aunt, thanking her for the contents of the box! I'm so curious how she'll react.
Our letter arrived a few days later. They saw that it said that it went with a box, so they set it aside, and had been waiting impatiently for two weeks for the box arrived before the friend and my husband finally talked on the phone and realized the mix-up.
Another slightly funny aspect to me is that there's something in the box that is wholly inappropriate and strange for the aunt to send (although not weird for one guy to send to another), so they were kinda weirded out by that and mentioned the strangeness to some family members at Thanksgiving. Oops!