Mr. Harkin

Greg explained in Cabin Fever page 69, that when he was 4, his parents had a cocktail party, and Mr. Harkin was in it. Greg went to use the bathroom, but he didn't know that he was supposed to lock the door. So Mr. Harkin went in the bathroom, but realized that someone was in there already, and went out. When Greg was done, he told his mom, and Mr. Harkin must've felt emberassed.