This is a real-live conversation from my house:
"Dad, aren't you allergic to shellfish?"
"Aren't clams considered shellfish?"
"Then why did you buy 'Clamato' juice?"
"Because it looks delicious!"
"But it has clams in it."
"No it doesn't. What makes you think it has clams in it?"
"Um, the fact it is called CLAMato juice. And the fact that it has a picture of a clam on it."
Isn't there a Bible verse about "the little child shall lead them?" Yeah. Cue the Benadryl.