Stop in for a cup of coffee

So teaching class yesterday I needed students to line up for some practical work. In my infinite wit, I use a George Carlin bit from the Toledo window box. I tell them "you tall guys behind the trees,you short guys behind the rocks".... Nothing but crickets, I ask for a show of hands of anyone that knows who George Carlin is, yep not even a single hand not even from the adults. Man I felt old!