"Knock Knock - Gladys" joke

Knock Knock
Who's there!
Gladys!
Gladys who!
Gladys Friday, arn't you! Knock Knock
Who's there!
Gladys!
Gladys who!
Gladys E. Yew! Knock Knock
Who's there!
Gladys!
Gladys who!
Gladys it's my last joke! Knock Knock
Who's there!
Gladys!
Gladys who!
Gladys the weekend, aren't you!