Once, when I was reading a college annual, she came to my apartment to pay a visit because she wanted me to buy an anchor as a wedding anniversary gift for my wife!
For example, a husband can plant a message at the place where he proposed, to be discovered by her on their anniversary, or for mountain climbers to leave congratulatory messages for fellow climbers.
Today, the day of my 29th birthday and two weeks after our 10th wedding anniversary, the only thing my husband got me for my birthday was divorce papers.