I can only give my own worst I gave to someone else.
It was at the end of a party where I'd had a line that went around the person's house...it was just crazy - fun, but exhausting. I gave some great readings that night. But it was a LONG night.
The last person I read for was the brother of a friend of ours, who was a real skeptic. I was so hoping to give him a great reading that would turn his disbelief into something else. But I was out of gas. The cards said nothing. So I gave a really generic reading. it sucked, and he knew it, and caught on to the fact it was generic. Plus I was totally done.

I was disappointed in myself.
I image he still feels the same way about tarot - maybe even more so. Which is too bad.