"Niacin"

http://knockville.com/comic/755b585363
Knock knock!
Who's there?
Niacin
Niacin Who?
Niacin quiet here. I think I'll go take my vitamins.
nadianana
nannynano
nantucketnathan
nebraskaneedle
nemonestor
nevadanew
newnewark
niacinnoah
noahnobel
normanorway
nosenoun
nuisance
 

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