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: this actually happened a few years back. little bit of back story first.

i am a bit of a knife collector. not any crazy fantasy blades or anything, i am partial to folding knives (particularly benchmade knives) and the like. i found out one of my friends was interested in the same thing so we would occasionally trade knives if we each had something the other wanted. i ended up trading him an old miscellaneous folding knife and in return i received a (very) dull curved, fixed blade. 

the handle was hand carved and dyed wood with deep reds and greens and yellows. the blade was a little bit crude and had a large finger hole in it. it looked a bit like a reverse karambit. on top of its clearly crude and vicious appearance, it had 'pakistan' stamped into the blade.

i had placed this knife into my backpack and brought it to a friends house with the intention of getting it sharpened but (luckily) ended up forgetting about getting it sharpened so it was still pretty dull.

a few days later my sisters ex-boyfriend had needed to borrow my backpack. like many things he borrowed, it took a long time to get back. when i finally received the backpack a month later i forgot to check the very easy to miss inner pocket in the middle compartment.

my mother, shortly after, asked me if i had an old backpack or something i could loan her for her trip to vegas the next day. i handed her that backpack, she asked me if anything was in it and i told her no.

i received an angry call a day later that my mother was going through airport security and they asked her if she had anything in her bag that they should know about, she said no. the lady continued to question her, she continued to deny it. i was then told the lady opened up the backpack, found the hidden pocket and pulled out a curved blade with a giant pakistan engraving on the blade and proceeded to grill her for a few minutes as to why she had something like this in her carry-on. it took a few minutes but she was let through security (and most likely onto a watch list somewhere)

now luckily for us all we are in canada. if she had been caught with that at an american airport she would most likely still be in guantanamo today.

TIFU by giving my mother a backpack containing a knife to use as a carry-on