Because B-shells are too small, and D-shells are too big.
The one with the biggest head.
Q: what does Oedipus the king's mother wear under her dress? A: a Freudian slip
Because D shells are too big and B shells are too small.
Her GPA was unda da C.
She grew out of her b-shells.
Because a and b shells are too small.
Cause she was too big for B- shells! (my 6 year old niece likes to tell this joke)
Because she can't fit into D shells