You don't often see an investor taking an entrepreneur's idea and giving it to a competitor, but that's exactly what Mark Cuban did on Friday's episode of ABC's "Shark Tank."

During the episode, Justin Crowe pitched his 3-year-old cremation alternative startup Parting Stone to investors, including Cuban. The company works with more than 600 funeral homes in the United States and Canada to provide mourners with polished stones containing the ashes of their loved ones — a sentimental, "comforting" way to remember them, Crowe said.