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, a couple of weeks ago, i found out that metallica was coming to beijing and decided to try to get tickets. just my luck, the tickets were already sold out at that point. i had a contact who had previously sold me hockey tickets and always had tickets to tons of different sporting events. i checked with him, and he told me that he still had some tickets left. i told him i wanted two of the cheapest tickets that he had, and assumed that was that.

fast forward to yesterday, he told me that the price had nearly doubled but not to worry. he said he was gonna get me tickets for the original price, but that he wouldn't be able to get me tickets. instead, he said my friends and i would give him the money for the tickets and he would have a security guard walk us into the arena to watch the concert. i was extremely skeptical, but he said we didn't have to give him any money until we got inside and had seats, so we decided to give it a shot.

we got to the arena today, and he told us that we were there 30 mins too late (concert was supposed to start at 7:30, but we arrived at 7:00, he said he told us to be there by 6:30) and that the deal was off now. he told us that he had no way of getting us in, because it was too late and it would be too obvious. we all decided to see if we could afford any of the tickets that the scalpers are selling outside. all of them were asking crazy amounts of money, like 2-3x the original amount. i was planning on buying two tickets and didnt have enough to pay the elevated prices for both tickets. one of the guys in our group brought a ton of extra cash and decided to buy one of the expensive tickets, but told us to hold the money and give it to the scalper only after he gets all the way inside the building. we waited. he texted us back. it was all good. so we all decided to split up and find tickets, since nobody had 6 tickets for sale. my friend and i found a guy that had two tickets and agreed on letting us give him a little more than the original asking price. we followed him to the side of the arena (at this point, i feel like i should mention that i do brazilian jiujitsu and muay thai and my friend that i was buying the ticket for was my mma coach, so we weren't worried about getting jumped), he pulled out two tickets. we inspected them. they looked legit. so i handed him the money.

we started walking towards the arena, and after a couple of seconds we turned around and tried to say thank you. the guy had disappeared. i don't mean like he ran off, more like he was there one second, then gone the next. it was almost like this guy was batman and disappeared at the drop of a smoke bomb.

we both had a sinking feeling in our stomachs, but we decided that the tickets looked real and there was nothing that we could do at that point. we walked up to the outer gate of the arena, and the guards asked for our tickets. we gave them the tickets. they checked them with a uv light, and then they let us through. we were nearly jumping with joy. then we got to the door of the arena, the guards asked for our tickets. we handed them over confidently. the guards put them in the scanner, and immediately called over the head guard. the head guard told them to try scanning them again. they tried. the same thing happened. the head guard told us that if we didn't leave the premises of the arena in about two minutes, he was going to call the cops on us. we asked him what was wrong with the tickets, and he said that they had already been used. we told him that we were sorry, and that we didnt know. the guard doesn't say anything except, "you have about one minute left before i call the police." we slowly walked back to the outer gate with our heads down. 

when we got outside, we tried looking for the guy but he was nowhere to be found. at this point, i was too pissed to continue trying to get any other tickets, plus i was out of money. i found the rest of my group and explained what happened. then my coach and i started walking back towards the subway station.

TIFU by trying to go to a Metallica concert...