Apart from secret songs what are some Easter Eggs you would like to see in Body Odor 2(Just a joke) zombies?

I'd like it if there was a secret weapon hidden on the map, like if on Kindergarden(Kino der Toten) there was a way to get a kinda weak gun like the BK or maybe a brand new one altogether.  It would be to powerful to aviod abuse and but it would be free yet hidden.