I've gotten the "you have the deck memorized" before.I did a simple key card effect, where I found the card by just waving my hand over the spread out pack and I was accused of when I turned around I spread through and counted each and every card in under 3 seconds so I knew which card was missing. I came so close to saying "yeah, it's taken years of practice and skill to be able to count each card that fast". I wanted to take advantage of the situation and make it look like I am more skilled than I actually am.