Order some joke/fake lottery tickets. One of the ones where every ticket wins $30k. Drop one on his driveway before he heads to work in the AM for him to find. I’ve only done this to two people and they both fell hook, line, and sinker for it. One lady was calling her husband to come pick up the winning ticket to keep it safe.
Anti-perspirant causes breast cancer. You look at data for Japan back in the 90’s-2000s and breast cancer was like 80 times less prevalent in Japan vs the US. Now Japanese are starting to use it more and breast cancer instances are raising to be more on-par with the US. The NIH did a study that was inconclusive so everyone assumes its not true. However, if you read the study you realize exactly how inconclusive it is, and that the answer was truly more along the lines of: “We don’t know”.