We have magnetic letters on our fridge, which my brother bought me just before we last went on holiday, in memory of the previous holiday which had magnetic letters on the fridge, where we indulged in a childish game of editing the other person's words by as few letters as possible. The best bit was when he wrote "homophobic nutter" and I changed it to "homophonic butter". Anyway...
The letters went on holiday, and came home and now they live on the fridge. For a while, we were changing the writing several times a day, now it can be weeks before inspiration strikes.
A few months ago I was doing some colouring with a child, and came home with a picture of an octopus, which I proceeded to put on the fridge, stuck there with the letters "octapus" (it's a cheap set - only one of each letter). Later, I decided to write the word "secrit" behind the picture - it's now stuck on at the corners with other magnets, with a small but I think noticable bulge where "secrit" is written.
That was about a month ago, and no one's seen it! I keep checking, because I'm sure if someone found it, they would change it to notify me they'd seen it, but no one has! 
So, AIBU to wish that someone would discover my "secrit"?
And whilst I'm waiting, what are the similarly silly things your family does?