This was my second visit attempting to use a $25.00 Restaurant.com certificate.  The first visit I realized that with plate prices between 9.50 and 12.50 that between two of us, we couldn't possibly meet the minimum purchase of $50.00.  My second attempt to use the $25.00 off was tonight with 3 friends.  We started off with an appetizer of Chicken Satay with peanut sauce and a cucumber salad.  YUM.  For entrees, Pad Thai, Pad Se Ew, Pad Wu Sen, and Squash Curry.  Very good, all of it.  The noodles on the Pad Se Ew were overdone, but OK.  The problem came with the billing.  The $25 off Restaurant.com certificate clearly stated that it was not valid on Saturdays.  Well, it was Friday night.  Our server said that the certificate was no good on weekends.  I clearly stated, showed her the highlighted exclusion for Saturdays, that it was Friday night, and that the exclusion is not for weekend nights...just Saturday.  She understood, and asked her co-worker to explain to us that the coupon isn't good on weekends.  I again said, it is Friday.  It's no good on Saturday.  She left, talked to a cook who hollered at her and nobody came back to talk to us and re-explain why the certificate was no good.  We left the full balance of the bill, plus generous tip, but will not go back.  It was very frustrating.