I make Marriage A Grim Era and turn your Mother in law into a Woman Hitler.
If you have ever asked someone to "stop banging the pots", you have used me before.
What am I?
(In reply to puzzle solution
by K Sengupta)
"A Grim Era" is an anagram of the word "marriage", while "Woman Hitler" is an anagram of the word "Mother in law ".
Thus, the word "I" referred to in the riddle corresponds to "Anagram".