The origin of Excelsior..

The Simpsons
Season 5: [1F07] The Last Temptation of Homer

Bart: What is this place?
Nerd 1: The refuge of the damned.
Martin: [gleeful] A place where we can work on our extra-credit
assignments without fear of reprisal.
Nerd 2: Come! You must be tired from the chase. Oliver! [claps]
Bring our friend a hard-boiled egg and some prune juice.
Martin: Finally, Bart’s one of us!
Everyone: Excelsior!
– Bart joins the nerd club, “The Last Temptation of Homer”