Does heart have legs?

One fine day at school, the teacher was teaching about the heart.

After she had finished she said, "If any one has any doubts about what I have taught please ask."

Little Johny stands up and asks, Teacher, does the heart have legs?"

She replies, "no it doesn't. What makes you ask such a question?"

He says "Last night when I went into my parents bedroom I over heard my dad saying SWEET HEART spread your LEGS.