Because D shells are too big and B shells are too small.
It's quite hard to find enough women willing to wear the same outfit.
Your noggin
Because B-shells are too small, and D-shells are too big.
Because she can't fit into D shells
She sells shesells...I mean...Sea sells sea shells...dammit! She's...a beachside entrepreneur."
Because D-shells are too big and B-shells are too small.