 Jef bets against his friendly rival Gerard about the angling competition, so he makes pharmacology student Dieter look for illicit substances in Gerard s fish food, and when that passes muster supply something he can spike it with so it will turn blue- an ideal tool to play pranks on the other students, but Jeanne mixes up the boxes... Betty s latest lover Louis-Philippe is a baron, which makes Jeanne s head spin enough to make the other students have a snack out of the baronial sight, and insists in vain she should keep his blue blood a secret; jealous Ria is determined to turn him off Betty, but ends up with blue  egg  on her face too.