How to make a non-jew feel like poo

I just had a quick conversation in the kitchen at work.
I was asked if I'm coming to Friday night drinks, and then they remembered that I can't because I'm Jewish and have Shabbat. I need to leave before it gets dark or I turn into a pumpkin.

So once they remembered, they said:

"Oh that's right, you're Jewish. How unfortunate."

And I respond:

"Yes. That's what Hitler used to say."