"Knock Knock - Howell" joke

Knock Knock
Who's there!
Howell!
Howell who!
Howell I get in if you don't open the door? Knock Knock
Who's there!
Howell!
Howell who!
Howell you have your toast, with marmalade or jam? Knock Knock
Who's there!
Howell!
Howell who!
Howell you have your pizza, plain or with extra ham?