I'd actually been sort of thinking of a challenge along these lines too but it's more specific - "cleaning out / reorganizing your closet" (or 'editing' your possession' as trendy mags say<g>)
The closet should only have items / clothes that were in the show. So, for example, Lois might have a chicken suit. <g>
What would be in Lex's closet? 2nd season Jimmy ? Cat's closet? Clark's closet??? etc.
Carol
