Because they are not Cs.
Everyone thinks it's 'R', but his first love be the 'C'.
B: "Log cabin!" A: "Nope, Houseboat. You forgot the C."
Gifts only for little girls with A's, B's and C's because the other ones already have the D's."
nothing
He heard that you have to stamp letters or the post office won't send them.
Vacation.
They wanted to hit the high Cs.
