Definition: In this task, you are given a Reddit post as a text. Your task is to generate a title for this text. The title should start with "TIFU by", followed by a situation that caused humor. The title should contain 7-12 words, ideally.
Input: Text: so this actually happened yesterday but anyway... i work at a dine in restaurant and i do the togo food. when a guest says thanks or something like that i usually say you're welcome. recently i've been changing it to no problem. im not sure why, i just like the sound of it. anyway, i as bagging up this lady's food and she said thanks and then asked for napkins. i was trying to say something along the lines of "oh yeah not a problem, and you're welcome." somehow i mixed up those two words and said "yeah, your problem." i then went to go get napkins (usually they are right behind me, but i had run out so i walked into the kitchen to get more). i realized after taking a few steps into the kitchen that i had just told her that finding napkins was her problem and i was walking away from her. i turned around immediately and she looked pissed. i explained the situation and told her how sorry i was and it was just a tongue mix up. she finally started laughing, but one of my co-workers saw me too and looked at me i complete disbelief. but instead of staying to see the end of the situation they later told the manager that night, and i had to explain to him that it was just a mix up in words. hahaha. not a good way to get tongue twisted.

I told a lady "your problem" while working and walked away.