shop the cloven foot
show the cloven hoof

And then, why then, she showed the cloven hoof!

F.D.R. was worse than Stalin because he lulled us toward Stalinism without showing the cloven hoof.

But Nature has another side which experience and sin are not slow in finding out, and it is no flippancy to say of the god Pan that he soon showed the cloven hoof.

Indeed what the Allies saw as Riza's intransigence over both this issue and that of the Armenians led to a Yugoslavian delegate claiming that Riza was "beginning to show the cloven hoof".

No French composer in the generation after Fevin and Brumel could disguise the secular flavour of his church music and sometimes Sermisy shows the cloven hoof of the chanson writer, but generally his Masses and motets are more 'Netherlandish'.