The Naked Truth (U.S. title: Your Past Is Showing [1]) is a 1957 British black comedy film directed and produced by Mario Zampi, starring Terry-Thomas, Peter Sellers and Dennis Price.

After attempting to blackmail a famous scientist (who commits suicide), and an MP (who suffers a heart attack in parliament, and probably succumbs), his latest targets are Lord Henry Mayley, television host Sonny MacGregor, writer Flora Ransom, and model Melissa Right.

When Dennis threatens to reveal all at his trial, Mayley comes up with a scheme to break him out of prison and send him to South America, with the help of hundreds of his other victims.

[1] The Radio Times reviewer wrote: "This black comedy supplied Peter Sellers with some of his funniest, and finest, pre-Hollywood material.

It's based – as the best British humour often is – on class and sex ... Mario Zampi directs the gags in Michael Pertwee's satisfying script with superb timing.