(to the tune of the "William Tell Overture")
Happy Anniversary, Happy Anniversary
Happy Anniversary, Haaappy Anniversary

Pour a cheerful toast and fill it, Happy Anniversary
But be careful you don't spill it, Happy Anniversary

Ooooo Happy Anniversary, Happy Anniversary
Happy Anniversary, Haaappy Anniversary
Ooooo Happy Anniversary, Happy Anniversary
Happy Anniversary, Haaappy Anniversary

Happy she and happy he, They're both as happy as can be
Celebrating merrily, their happy anniversary

Ooooo Happy Anniversary, Happy Anniversary
Happy Anniversary, Haaappy Anniversary
Ooooo Happy Anniversary, Happy Anniversary
Happy Anniversary, Haaappy Anniversary

We now state emphatically, it's happy anniversary
Not another day could be, a happy anniversary

Ooooo Happy Anniversary, Happy Anniversary
Happy Anniversary
Happy (slow)
Happy (slow)
Happy, happy, happy, happy, happy, happy, happy, happy (fast) Anniversary!!!

(Gioacchino Rossini; arr. William Hanna / Joseph Barbera)

One suggestion I've taken to doing: Post one thing you love about your spouse for each year of marriage.