I have to give them a one based on my experience.
We ordered 2 decent sounding burgers and two drinks.
I offered him my still valid Groupon on its expiration day. He said that meant that it had expired the day before.
I left. I contacted groupon.
They said I was right.
But the thief owner of Lucky's had redeemed it and marked it as used just as he was telling me it couldn't be used.
Classy. You stole $13 from me.
I'll laugh when you go out of business.
Update: These thieves went out of business just as I knew they would. Ha ha.