The strip is about a boy (Finbarr Hawtrey Saunders) who is always overhearing ambiguous conversations, usually between his divorced mother and their neighbour, Mr. Gimlet, with whom she always eventually ends up having sex. For the majority of the strip, Finbarr does nothing but laugh at the double entendres he hears, making noises such as "Fnarr! Fnarr!", "Warf! Warf!", "Tsssk Tsssk", "Chortle Chortle" and "K-Woo! K-Woo!", until the end where he (usually) mistakes the sounds of his mother having sex for something much more innocuous. According to Viz Holiday Special 1988, Finbarr attends Talbot Rothwell High School, a reference to the script writer of the Carry On .
When talking of his wife's antiquecamera, a man says; "I've spent many a hot afternoon with my face under her hood, flicking away at that button, trying to make those leathery old flaps open up."
When talking of his photo enlarger he says; "I've got a small Johnson, but it can enlarge to nigh on a foot when it is turned on in a darkened room"
When demonstrating how easy it is to take off the lens he says; "A few quick twists of the wrist and it comes off in a couple of seconds... Mind you I haven't had it off in ages, so it was very stiff this morning"