Sylvester Stallone – Rhinestone (1984)

The Expendables 2 probably has the starriest ensemble cast ever assembled, but while each star has made millions from their movie career, they haven't always had the greatest taste. When prompted to think of a truly terrible Sly film, the obvious choice would be to go for 1992's tragicomedy Stop! Or My Mom Will Shoot. Rewind a further eight years though, and you'll find country musical 'comedy' (apostrophes very intentional) Rhinestone, which features Sly as an obnoxious New Yoik cabbie who's taught how to sing by a perky, tinnitus-inducingly loud Dolly Parton. The ear-bleeding finale – featuring a jaw-droppingly incredible singing solo from Mr Stallone – has to be seen to be believed.

• Watch: Exclusive featurette behind the scenes of The Expendables 2