: Complete with hairy feet, Leonard chooses a costume that he believes makes him look adventurous, though he is frequently mistaken for an Elf.
The comedy begins long before the party starts, as the four friends realize they have all independently decided to attend as . After a brief "debate" (and several costume changes), they settle on a more diverse—though no less eccentric—lineup:
: Sheldon's refusal to wear a "simple" costume like a zebra highlights his disconnect from social norms.
: Leonard’s choice of Frodo is symbolic of his quest to "step out of the Shire" (his apartment) and win the heart of someone outside his comfort zone. Series 01 Episode 06 – The Middle Earth Paradigm
: Or as Raj points out, looking suspiciously like Peter Pan. The Social Collision
The party introduces , Penny’s physically imposing and intellectually underwhelming ex-boyfriend. The "paradigm" of the title refers to the stark contrast between Leonard’s world of Tolkien and physics and Kurt’s world of physical dominance.