Crossword Heaven

Answer: KNOCKKNOCK

KNOCKKNOCK is a crossword puzzle answer that we have spotted 14 times.

• Kind of joke
• Start of a joke
• Start of many a corny joke
• Beginning of many jokes
• 1940 cartoon in which Woody Woodpecker debuted
• Many a joke's start, either part of which is synonymous with the ends of 17-, 25-, 37- and 52-Across
• Joke's first line, often
• Start of a rap joke?
• *Joke starter
• First line of many puns
• Visitor's second attempt
• "Can I come in?"
• Classic joke start
• First line of some jokes