Given the following context:  This camp screwball comedy of errors, that includes many over-the-top stereotypes, is set at Halloween against the backdrop of West Hollywood, California. Five friends, interior designer Evan (played by London); interior designer Harvey (played by Cheng); African American stockbroker Dave (played by Meadows); Latino spinning instructor Fredrico (played by Sabàto); and Emme (played by Ubach), a sassy young woman obsessed with style and classic movies, have all been anticipating the West Hollywood Halloween Parade on Santa Monica Boulevard, which is the biggest and brashest block party of the year. Their annual tradition of joining the festivities in outrageous costumes has become part of local legend. It is the night before Halloween, however, and they still have not decided what to be. Evan and Harvey, who are femme gay boyfriends and business partners, have come up with food-themed sushi costumes that everyone refers to as "wasabi tuna." Emme offers another suggestion — that they all dress up as gang members. They all opt for the gang theme, but are unable to find the appropriate attire at the local stores. They then decide to seek out real life gang members in order to achieve the authentic, straight-from-the-hood look they want. While doing interior design work for an extremely wealthy Armenian woman who is actually in the illegal drug trade, Harvey and Evan become unwitting drug couriers. After they are arrested, there is a comic scene at the WeHo sheriff's station with them attempting to talk their way out of trouble. Dave goes to East L.A., where he comes across a real gang member named Romeo (played by Díaz). He makes a deal with Romeo to loan him his Porsche in exchange for his lowrider gang car. A case of mistaken identity makes a vengeful, rival gang get after them. There is a comic drive-by shooting scene. Also, by driving Romeo's lowrider they are unknowingly carrying an illegal cache of weapons.  answer the following question:  What is the name of the theme Evan and Harvey have come up with?
wasabi tuna