Generate a new joke by editing the following sentence
Knock knock, who's there?
Knock knock, who's there? Boo. Boo who? Don't cry, it's just a joke!
Complete the following task based on the instruction and optional input provided.### Instruction:
Generate a new joke by editing the following sentence

### Input:
Knock knock, who's there?

### Output:
Knock knock, who's there? Boo. Boo who? Don't cry, it's just a joke!