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: i have a few fu's worthy of here, however this is the most recent and shall therefore be posted. 

as usual it didn't technically happen today, this actually happened just before new year. the 30th december to be precise. 

a little backstory: i am an expat and live in a different country than my home country. to make christmas easier; me, my wife and young son (<2) had travelled to central europe to meet my parents and enjoy a lovely (cheaper than returning home) trip. we were staying in a lovely apartment in a european capital city. the (penthouse) flat was on the top floor of this apartment block and the front door opened straight into the lift - basically, the lift button was inside the apartment: when you unlocked the door (self locking and no handle on the outside), the lift would be right in front of you (this is also important knowledge for later.)

all was going well, we had a lovely trip. the beer was cool, the food was reasonable and my son hadn't caused any damage (for any redditors who are parents, you will understand this is always a concern when renting a holiday apartment). until, it was leaving day...

we pack up our things, begrudgingly head to the fancy lift/door and leave. with 4 suitcases, a pram and a young child, this took 2 trips. the first trip was me, my wife and son with 2 of the smaller suitcases. my child is being occupied by a nice shiny coin. as i am loading up the lift, my wife and i are discussing where our passports are, do we have all of our electrical items, do we have enough toys to occupy a child for the 4hour ~~torture~~ flight. i have to be honest, we weren't paying much attention to the little one.

i leave them downstairs and head back for the remaining items, which are still upstairs in the flat with the women who is checking the flat on behalf of the owner. she's happy with the flat, i have one final scoot around: nothing left! result! all is going well... too well to be honest!

we get in the lift and close the door. slam. she goes to double lock the door when the key won't go in properly. after a few attempts, i offer my help. nope, the key will not turn. i like to think of myself as a modern, younger and more handsome bob the builder, so i look into the key hole and see a small coin pushed into the hole. 

bugger, i knew it was all going too well. my darling of a son had found great delight in storing his coin inside the lock! however, i thought i could get it out. at this point, i have said nothing to the women (she is still unaware of what is going on) and i try to coax the coin out with a smaller, flatter key. this is where the real fu happened: rather than pull it out, i succeeded in actually pushing it in further into the whole than a drug-smuggler would push his drugs into a certain body cavity. 

as all men do when we have failed and are partly at fault: i gave it up as a bad job, said nothing and shrugged my shoulders. she told me not to worry, the flat owner was coming back on the 2nd of january, the door was at least locked once and he would sort it with his keys (oh, the bliss of ignorance)! 

reddit: i feel guilty and i am consoling myself that i left at least 10 high quality belgian beers in his fridge!

TIFU - By not paying close attention to my child...