|Jumbo! He is slain.|
Namely, that the popular use of the term "jumbo" to refer to something very large (eg. Jumbo-sized playing cards, JumboTron, ) came after the elephant. That is, they didn't name him Jumbo because that meant big; we use "jumbo" to mean big because it was the name of a big elephant. 
That's crazy! I mean, imagine if your name became an adjective simply because it was your defining feature. People for years to come would name their popcorn, televisions, and mattresses after you, likely without even realizing it.
Or, even stranger, suppose you were an elephant.