Lexi Burke, also known as the Serial Tipper, gave a huge surprise to a young boy running a lemonade stand in Nashville, Tenn. Thirteen-year-old Niko had set up his lemonade stand to raise money so he could join his soccer team on a trip to Portugal. Burke and her husband stopped by and used her Venmo account to raise $1,100 for Niko’s trip. That was enough to pay one-third of the trip costs, so they set up a GoFundMe page to raise the rest.