Dead for Money

My best friend loved getting something for nothing. One day, she picked up a red envelope she found on the street. I warned her to be careful, in case someone was trying to steal her years of life. She said I was crazy. Who still believed in that sort of thing nowadays? "It's only a few bucks in that envelope. Is there any need to make such a fuss?" A few days later, my best friend drowned in a lake.