Three cards are produced, the backs prominently displayed.

The top card is turned over showing the face to be blank, turned back, and slowly placed to the bottom of the trio.

When the new top card is turned over, it too is found to be blank!
 
The effect is repeated again and again, both slow and fast, until your audience is convinced that all cards must be blank.

To prove them wrong, you do it one more time, very slowly, with the cards laying on the table.

As you turn over the blank top card, they jump for the others trying to prove you wrong and find two jokers inwardly laughing at them!!!!!!!!
 
And all this is done without sleight of hand!