#who's vs whose

[allfourone2017]

When we drop salutations

Friend: Whose period is it next?

Me: Chaiw

[linkedinmemes]

I like people who use spell check

[thenthehumans]

Confession pt 3 - Grammatical Edition

The only reason I know the difference between whose and who's is because of the show "Whose Line is it Anyway?" and the only reason I know when to use the word whom is because of my favorite knock-knock joke. 

Knock Knock?

Who's there?

To

To Who?

To Whom!!!!!