Palantir stock has experienced a five-year roller-coaster ride.Five years ago, Palantir (PLTR 0.57%) stock benefited from a different boom. At the time, investors scrambled to buy shares as rock-bottom interest rates sent investors into what at the time were emerging tech stocks.Nonetheless, over the last five years, Palantir took investors on a roller-coaster ride that few could have predicted. Palantir's returnsIf you'd invested $100 in Palantir five years ago, you would have$935 today.However, the gains ...