Wedding guests write notes and slip them in whatever year bottle they want. Open it on your anniversary that year.--this would be especially special for the later years where maybe some of the people who put something in those bottles passed away.
If you send a wedding invitation to the President, you will receive a congratulatory letter from him and the First Lady! ps, it works for mickey mouse and queen of england too. Great for scrap booking or memory box..i had no idea you could do this but its so cool!