I'm pretty pissed. I'm a server, as most of you can probably guess, and as with all restaurants we have a few coupons and Groupons floating around for people to use. I don't mind when people use them cause I'm all about saving a few dollars here and there, but what I DO mind are when they don't tip properly on their totals.
Example: Couple came in and ordered food amount to about $63 or so. They had a Groupon that knocked their total with tax down to $20. And they tipped me $5.
Do NOT tip on the discounted price. No, no, no, NO. It's wrong and you should never do that unless you want your server to hate you forever. If you are an ass who's going to do that, at least give them a heads up so they can give you discounted service to go with their discounted tip :V
Also! While I'm ranting. Do NOT give them a vocal tip. Don't faun all over them and tell them how wonderful they are and then leave a 10% tip. No. You shouldn't build someone up and get them all excited and happy that their doing a good job and then slap them in the face. I'm sorry, but your voice doesn't pay my bills.