Beavis & Butthead

Passwords.

Level 2: YEA, WOA, YAH, YEA, YAH, YEA, YEA, YEA
Level 3: WOA, WOA, YAH, YEA, HEE, HEE, WOA, WOA
Level 4: YEA, HAH, YAH, HEE, YAH, YEA, YAH, WOA
Level 5: HAH, HAH, YAH, WOO, WOA, YEA, YEA, HAH