Narrator: HISTORY'S CHUMPS
T-Rex: History is full of chumps, you guys!!
T-Rex: Today's historical chump is William H. Mumler (born 1832), who was a photographer guy who did portraits! Only he wasn't a very good photographer guy because one time he accidentally double-exposed some film, and the resulting image showed one portrait clearly, but also showed a ghostly image of the other portrait!
Utahraptor: So he threw it away and reminded himself to not make that dumb mistake anymore?
T-Rex: Nope!
T-Rex: Instead he embarked on a career as a SPIRIT PHOTOGRAPHER and made a lot of money duping a lot of people, including Abraham Lincoln's widow. Only, people eventually started to notice that his "ghosts" looked an awful lot like living people around town!
Utahraptor: Hah! Whoops!
T-Rex: They ALSO eventually noticed how he was breaking into their houses so he could look at photographs and figure out what his ghosts were supposed to look like.
T-Rex: Anyway like everyone else from history he eventually died and now his entire life has been compressed to a short story, the end!