 Jef and Jeanne give each-other the silent treatment because she wants his lice-infested plants removed; Odilon and the students try to mediate. Billy has an Adalucian girl-friend, so he learns Spanish instead of studying for his exams. To Charles-Victor s horror, Koen finds head-lice in his hair, which they try to kill with Jef s defective plant lice-insecticide, and soon the others find out. Billy panics when he finds he now has pubic lice- the stronger chemical Xylol which Betty brought from the college lab for C-V is now in multiple secretive demand and her use-instructions prove painfully incomplete...