Things to say to annoying guys on the bus?

These two guys think im absolutely oblivious to everything. They have this weird name for me that has nothing to do with me. Its "roshnies" and theyll use it in their sentences and its pretty much just to see if i notice. today, they asked me to facee foward and then proceeded to lightly kick the back of my seat and laughed when i said i couldbt feel it. that was because it was extremely light. other times i just completely ignore them, even if i do hear them. do you have a comback i can say that will shut them up. it needs to have something about choosing to ignore them and not being deaf because they keep calling me deaf.