After 20 years of marriage, a wife finds out that her husband had been f*cking her for the past 20 years with a magic wand! she is so angry she asks her husband to "Explain the magic wand".
There once was a policeman of Munchen
Whose tool it just would not function
For ten years of his life
He deceived his poor wife
With some snot on the end of his truncheon.