sometimes you can put it back without them noticing and then just do it again. I did this when i was doing my sponge ball routein someone noticed me do something that would have given away most of the trick but i just undid my move and showed my hand was empty and did the move again when he wasnt looking!

Tom

yeah that's what I sometimes do. then they sort of know how you did it but are still impressed

Spec: Let me see that!
Magi: Well I only give it out to people who say "please."
Spec: Please???
Magi: You had your chance.

that's a good one....il use that

Thanks I devised it myself .

if its a gaffed deck/coin, just keep a non-gaffed spare in a pocket. If they say anything, ignore them until you put the gaffed one in your pocket, then react and if they still want to see it, pull out the regular one.