You don't have to go home, you just can't stay here

Why is it that people find it OK to stay in a restaurant well after the time they have closed? I've had this happen a couple times now in the past week and I don't mean just a half an hour, I mean well into the time where we have been closed for almost 2 hours! I understand we are open til said time and that you can come in anytime before then and get a table and still get food, but your first hint should be when I tell you that the kitchen will be closing in x amount of minutes and I need to get your order in. Why do you feel the need to express that your food came out quick, of course it did, you are the only ones eating still! Now we have been closed for some time and you are taking your time eating? Did you not notice the guy stacking all the chairs? Oh what's that you want to look at a dessert menu? Did you not listen when I said kitchen closing soon about 45 minutes ago? Oh you just want to sit and talk for a bit, sure, but don't do it here! Look I understand people like to enjoy their dinners and drinks, but realize that many of us have already worked a long night and just want to go home so we can enjoy our time too. I love when I heard this sentence uttered by both my tables both nights "Oh I think we should leave soon, or we are going to be the only people left in here." No don't worry, you guys ARE the only people left in here! It's not like I can hang out in Best Buy after they have closed just because I came in just before they closed, no, they are going to tell me to bring my selections to the front for purchase because they are closed. So why is that people feel the need to utter "Well I guess we better let him go home." or "Looks like they are waiting on us." Oh, and just because you gave me your credit card to pay, doesn't mean I don't still have to wait for you to sign it so I can enter the tip in my sales so I can get my money, yeah I need that thing back before I can finish up and go home, so putting it down and sitting to talk more does not make me like you anymore than I already didn't. Jesus! Go to a late night coffee shop to sit and talk, hell they are lots of fun and you can still get drinks made while you are there, oh and they have free wi-fi so when your date goes south at least she can look busy on the internet on her iPhone!