The show also includes humor based on the historical figures themselves. For example, the diner the clones frequent is called The Grassy Knoll, a reference to the JFK assassination conspiracy theory about a second shooter, dubbed "The Man on the Grassy Knoll". Other references seen are the flag at The Grassy Knoll being permanently at half mast and the car on the roof of the diner containing the original JFK's body leaning over the edge. There are pictures of assassinations hanging on the walls of the restaurant, such as the famous of the Lincoln assassination (though this version is in color and considerably more graphic than the original print). The genetic ancestors of all of the five main clones died of similarly irregular causes: three assassinations, one execution and one suicide. Other historical figure-based humor includes offhand coincidental remarks to other students, such as Abe mentioning that the clone of Napoleon is so annoying because of "some kind of complex", or Gandhi telling Catherine the Great to "get off her high horse".