This Is the Only Level/YMMV

Both levels provide examples of:

 * Ear Worm: Polka, on repeat, used rather well, but so catchy.

Level 1 provides examples of:

 * Paranoia Fuel: The "Worried about nothing" stage.

Level 2 provides examples of:

 * That One Stage: "Corpse Shot".
 * Another contender is "Freefalling", which has . Let's just say that if you make it through this stage without feeling the urge to rip all hair out of your head, you are either an amazingly good player or a liar.
 * "AMAZEing" on FML mode.