Kohta Hirano said in a side note in Order 05 of the manga, “It’s beginning to seem like everybody wears glasses. What to do?”

On the twelfth day of Christmas my vampire gave to me
Twelve pairs of glasses
Eleven yellow roses, ten hellhounds barking
Nine manga volumes, eight ghouls a-moaning
Sven Catholics preaching, six silver bullets
Five pints of blood!
Four DVDs, three cigars, two giant guns
And a translated Hellsing CD

*Right to left, top to bottom: Enrico, Heinkel, Walter, Rip, Doc, Major, Luke, Father Renaldo, Young Integra, Yumie, Alex, Alucard.

On the thirteenth day of Christmas my vampire gave to me
Thirteen Hellsing orders
Twelve pairs of glasses
Eleven yellow roses, ten hellhounds barking
Nine manga volumes, eight ghouls a-moaning
Sven Catholics preaching, six silver bullets
Five pints of blood!
Four DVDs, three cigars, two giant guns
And a translated Hellsing CD

Seras: What’s been going on in here?

Hellhound: Woof!