[Update: You missed it; and it was a 60% discount!]
Before midnight tonight, score a future $50 worth of delicious Chinese fare at Friendship Restaurant (2830 N. Milwaukee Ave.) for just $20 through Groupon, your collective bargaining agent. (So, you may have noticed: in my haste to get the information out, I got a little dyslexic with the math.)
Click this Groupon link for particulars on the offer (e.g. dine-in only, Tuesdays excluded -- hey, Tuesdays are already a bargain!) and to buy your "groupon."
If you've never been, see B.Y.O. Be Mine for a taste of what to expect at Friendship. It's not what you might expect from it's surroundings.
Offer expires at midnight!