Knock Knock
Who's there?
Elizabeth!
Elizabeth who?
Elizabeth of knowledge is a dangerous thing!

Knock Knock
Who's there?
Elke!
Elke who?
Elke Seltzer - Plop Plop Fizz!

Knock Knock
Who's there?
Eli!
Eli who?
Eli, Eli O!

Knock Knock
Who's there?
Ella!
Ella who?
Ella-vator. Doesn't that give you a lift!

Knock Knock
Who's there?
Ella Man!
Ella Man who?
Ella Man-tary my dear Wartson!