I've written before (read here) about the trend among kids to raid the parents/grandparents drug cabinet and get high on prescription medicine. It's a HUGE issue now. Don't pretend like you are immune.
Sadly, even innocent taking of medication can kill kids. Read this story about a young man who had everything going for him. He took a "normal" dose of his Grandmothers "pain pill" and died from it. For his bodyweight, he took 4x too much.
He wasn't partying, getting high or experimenting. His shoulder hurt and he took some pain medicine... and died.
Read the story. Then go lock up your pills, and call your parents and tell them to do the same.