Restaurants all over are offering specials. Two for ones; buy one, get one half off; free apps or desserts with a regular entree; happy hour and early bird deals. The list goes on--all in the name of keeping tushies in the seats. But what do you tip on? If you've bought one entree at full price and a second entree at half price, does the server get hosed in the deal? Shouldn't we be taking into account any coupon/special discount we've received and tipping on what the total should have been without the discount?