When you go out to eat with friends, randomly choose who pays for the meal. In the long run this only increases the variance of your money. I think it's fun.
This is likely to increase the total bill, much like how splitting the check evenly instead of strictly paying for what you ordered increases the total bill.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.