I think the episode where people were leaping into Sam (he was in an crazy house and had received a shock of electricity) one of the people whom Sam had been in and performed life-saving CPR with said of his experience (something to the effect of), "And suddenly I knew what to do..." as though what Sam did lingered in their mind as an inspiration.
Actually, those people weren't literally leaping back into Sam - he was just confused and taking on their personalities because of the shock to his system. It was only the FINAL shock that caused a leap.