Never. I straightened it every day back in high school, got tired of waking up early to blow it out every day around my second semester of college, and haven't straightened it since. Sometimes I loosen my curls a little bit by applying products to wet hair and twisting it up in a claw (this gives me loose waves), but I never completely straighten it.
With your feet in the air and your head on the ground
Try this trick and spin it, yeah
Your head will collapse
If there's nothing in it