Misusing the relative pronoun is a slippery slope, and can end in whomlessness.
grammar
As I was studying grammar, I realized that music star Dolly was no longer attractive. It must have been the Past Parton Supple.
Somebody punctuated me in the face, and I ended up in a comma.
I hate people who speak in sentence fragments. They are so phrasist.
I confuse my verb order, in tense situations.