Reptilicus

The Danish production company Saga and the American producer Sidney Pink appear to have had ambitions to release the Danish monsterfilm Reptilicus in USA too as a version in the English language exists alongside the Danish version. I doubt that the American filmgoers ever got the chance to see Reptilicus, though, since it is so bad that it is unintentionally funny - which is why Reptilicus has managed to become famous, or rather notorious, after all.

It has bad acting, photographing, editing, special effects and songs (!) that should never have been there at all.