Knock, knock.
Who's there?
Spell.
Spell who?
W. H. O.
Spell
Categories
Explanation
Experiment
Explain Bear
Listen up, buttercup! The joke is that the person at the door says "Spell" as their name, so you ask "Spell who?" But it sounds like "Who," ya get it? You probably don't, but that's fine. You're probably one of those folks who still uses Internet Explorer.