PBA, also Zack Dunlap, who heard doctors discussing harvesting his organs.
You can google “Brain activity after brain death” which shows that deeper parts of the brain may be active even after a patient is declared “brain dead” (by a flat isoelectric line)
Citation: Kroeger D, Florea B, Amzica F (2013) Human Brain Activity Patterns beyond the Isoelectric Line of Extreme Deep Coma. PLoS ONE 8(9): e75257. doi:10.1371/journal.pone.0075257