hahaha i love this thread, my co-worker just asked me why i'm laughing like an idiot.
i can't remember what the worst experience i've ever had was, but just last week i went to lunch with a couple of friends and didn't tip because service was unimaginably bad. we waited half an hour before they even took our order, then brought my friends two cokes in cans, with two glasses, no ice or anything, just dumped the cans on the table. and this wasn't a fast food joint either. then they took half an hour to bring us our order, and fucked up half of it, and then acted like total bitches when we told them the orders were wrong. and then when we paid the bill and didn't tip, the bitch waitress comes up to us and tells us we HAVE to leave at least 15% tip, and i told her that tips aren't mandatory, and that i pretty much always tip about 20% but in this case we didn't tip for a reason, and that reason is that she's not doing her job.