I've decided to not make eye contact with him and pretend he's not there

My coworker was straddling a Christmas tree box trying to tape it shut and I was dusting the shelves. He came in the room and just stood there staring in silence like he always does. None of us talked to him and after 5 minutes of watching us, he walked away. And then walked backed in to stare at us. Instead of staying at the front if costumers come in he has to see what we are always doing.