News You Can Bruise for 2003 March 12

Ever since When Jokes Collide I've been obsessed with meta-knock-knock jokes, especially ones that use "the interrupting x" to signal their meta-ness. Here's my current favorite:

"Knock knock."
"Who's there?"
"The interrupting time traveller."
"The interrupting ti--"
"Knock knock."

Not as good, but more meta:

"Knock knock."
"Who's there?"
"The."
"The who?"
"The punchline."