What a Whopper is a 1961 British comedy film directed by Gilbert Gunn and starring Adam Faith, Sid James and Carole Lesley.

Struggling young writer Tony Blake is served an eviction notice by Mr Slate from his rented room in a Chelsea house shared with other artistic types including abstract "flicking" painter Arnold.

Tony hatches a plan to drum up interest in his rejected book on the Loch Ness Monster by faking a sighting of the creature.

Tony and his friends arrive at a Loch Ness inn, whose landlord Harry Sutton is trying to conceal dozens of poached salmon from two local policemen.

In the midst of these events, Vernon and Charlie decide to get married, Marie falls for Tony, and the poached salmon are inadvertently loaded into a police car.

Aspiring writer Jeremy Lloyd was working as a travelling salesman of rust-proof paint in the late 1950s when he wrote a story called "What a Whopper" about a Cockney youth who runs tours to see the Loch Ness monster.