You know in cartoons and movies when there’s a villain who poisons a glass and then switches them and then the protagonist has to guess which one is poisoned? Call me paranoid but that’s why I don’t drink wine with people who have mustaches and wear top hats (or short dudes who use the word “inconceivable”). But if my name was written on a glass in chalk, I could check to see who had chalk all over their pants after they tried to be slick and rub off the names. Normally something like this costs around $20, but a clever DIY blogger realized that chalkboard paint and some painters tape would be much cheaper per glass. So make your own and get to selling ‘em on etsy for 5 times what you spent on supplies. Make sure you use “vintage” and “whimsicle” in your description at least 6 times.