Toc H Puns

Dad told me this one:

A German teacher was having one of his students imitate various objects. He would say car and he would say "vrooom" or sink and he would say "Fsssss" then finally he asks him to imitate a clock and so the student says "tic, tic, tic, tic." And his teachers face moves to an eerie smile and he says, "We have ways of making you toc."