The weirdest advice I got was when I was a child and it scared me silly.
I was about five years and had discovered the wonderful and beautiful art of something called swearing. The day I learned to use swear words I began throwing insults around like I was Oprah giving away free cars. That was, until an old woman who looked like a witch told me that if I kept cursing too much, my penis would fall off. I didn't whether she was right or not, but for six months, I didn't swear ONCE. Just in case.