Have a lot of cosplaying anime fans, make the Vault a convention, and have a somewhat smaller population of rabid anime haters with megaphones. Observers will be given complimentary popcorn, candy, and soft drinks.
From that same basic idea, have a vault of geeky, not very religious people into stuff like video games, violent movies, books about magical things like Harry Potter or Lord of the Rings, tabletop gaming, rock, rap, and metal music, anime (not to the extent of the above, however), and anything that causes moral panics. Put in some fundy families. The same complimentary snackfoods will be provided to observers, along with puzzles, quality reading material, and other mentally stimulating things to prevent the onset of retardation.
From that same basic idea, have a vault of geeky, not very religious people into stuff like video games, violent movies, books about magical things like Harry Potter or Lord of the Rings, tabletop gaming, rock, rap, and metal music, anime (not to the extent of the above, however), and anything that causes moral panics. Put in some fundy families. The same complimentary snackfoods will be provided to observers, along with puzzles, quality reading material, and other mentally stimulating things to prevent the onset of retardation.