Three plastic cups of cola on a table, the red cup is labelled Republican, the blue cup is Democratic and the Libertarian cup is ? color.
People taste the colas, just like the old Pepsi/ Coke taste tests.
The Republican spews out the cola in his/ her cup and says: "Slavery!!" "Marxist!!" (a horrible look on their face).
The Democrat does the same thing.
The Libertarian drinks down the whole cup with a big smile and says: "Freedom!!" "Refreshing!!" "Libertarian!!"