There a couple of lines from OFAH that crack me up whenever I hear them...
SCENE: Hospital where Albert being treated for food poisoning
DEL: C'Mon Rodders. You're the one with the GCEs.
RODNEY: Del, I've got a GCE in maths and art, not a GCE in pork!
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SCENE: Dentists waiting room where the receptionist is arguing with Del. Trigger approaches
RECEPTIONIST: What do you want you moron!
TRIGGER: Just a couple of fillings
It's the thought of have a qualification in pork and having a receptionist speak to someone like that without the visitor batting an eyelid that always tickled me.