i don't get this joke and was wondering if anyone could help?

F

fran

New member
Knock knock
who's there?
Alexander
Alexander who?
Alexander 'usband!

now i really dont understand this joke and my friend told it to me and i just kind of laughed along but i can reli make no sense of it - i have even tried saying it fast to see if it makes more sense that way but it just doesnt? Help?

thanks
 
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