Try wearing all red clothes and see what reaction you get. It certainly is an assertive colour. YOU WANNA ARGUE?
Why not get some big earings with text on them. Make em yourself. Write on them different things on different sides. Like MYOB (TGIF for the end of the week) or any other acronym you fancy.
or better still put "U R an R" on one and "SOUL" on the other. It may take him a long time for the penny to drop.
But then do you want to work there much longer?