I'd say mine would have to be this cel here. 
*licks cel and sticks it to her post*  I have a
near-allergic aversion to Pretty Sammy as a
show, and in addition I have this massive pet
peeve about dealers and eBayers selling Pretty
Sammy cels listed as Tenchi Muyo cels,
so the notion of someday actually BUYING a cel
from that show was near-unthinkable.

Until I discovered this one of Pixy Misa dressed
as Captain Harlock.  **giggle**  An anime homage
cel, wheee!