Knock Knock
Who's there?
Spock!
Spock who?
Spock louder!

Knock Knock
Who's there?
Stacey!
Stacey who?
Stacey'ted until the bus stops!

Knock Knock
Who's there?
Stalin!
Stalin who?
Stalin for time!

Knock Knock
Who's there?
Stan!
Stan who?
Stan back or I'll shoot!

Knock Knock
Who's there?
Stanton!
Stanton who?
Stanton here answering questions is no fun!