Happy Accident Don? I have had people take the deck from me and ruin the trick many times, In times like those I need to learn to instantly palm the card.
I was doing a trick at school a few years back and a girl walked up and snatched the card from my friend's hand, tore it and bent it while grabbing it. This was with my lovely and favourite deck at the time, the Deck one v2. D: I demanded $10 from her (the amount it cost me to pay and ship the deck) but never got it, Thinking back now, Probably just something that came out of my mouth like what happens with a child