A Hat That Grows Hair
The cringe is strong with this one. Invented by Alois Merke. He promised that anyone who wore his “New Kind of Hat” for just 10 minutes a day would regrow their hair in just 30 days, guaranteed. You can trust him due to the thousands of cases of baldness he treated. Apparently there was no upfront cost. Just mail in a coupon, and only send the money if you are happy with the product. Perhaps it was just a gag, or perhaps a vintage style phishing scam. Falling for an identity theft scam will lose you more than just hair.