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'm not completely sure this story works in english, but i'll try to tell it anyway. 

this happened last week when i was conducting the last part of the experiment that is to be my master's thesis. the field of study is cognitive neuroscience, and the last part of the study was an mri (magnetic resonance imaging) experiment. in order to get a signal to detect, mri scanners need to have a large static magnetic field. the one i was using had a b0 of 3 tesla. in comparison, a typical refrigerator magnet is about 5 mt. also, the b0 field extends around the scanner about 1½-2 meters. i'm telling this because it should now be fairly obvious that bringing anything magnetic close to the scanner is a very bad idea. furthermore, even though a lot of metals aren't magnetic, they can still distort the images pretty badly and thus rendering them useless. we are therefore very careful to check ourselves as well as our participants for any magnetic material as well as non-magnetic metals close to the area of interest. 

so this was one of the last days during a full week of scanning. i had my routines up and running, and there i am, preparing a participant to be put in the scanner as i had done 20 times that week prior to this incident. participant movement while scanning is often the cause of useless data, so we try to fixate their heads a little with small foam pads. as i am stuffing these foam pads in between the participants head and the bed coil (a sort of bowl where the participants head rests in), i turn around to grab another foam pad, but as i do this i feel something pulling my pants around the area of my groin. i'm pretty startled by this, and exclaim out loud while making eye contact with the participant "woah, i think i have some iron in my pants!". 
now this is where the english translation might not work too good, but in danish when you have a boner it's commonly referred to as "having an iron on". 

as soon as i had made my exclamation, i realized that i had basically just told a rather pretty female participant lying on the scanner bed with her head inches away from my groin that i had a huge boner. fortunately, all she did was laugh hysterically. all i could do was try to remain cool and professional and act as if i was completely oblivious to what had just transpired. as soon as i closed to door to the scanner (air sealed, 3" thick), i broke down crying with laughter. someone else had to take over the rest of that session, as i couldn't keep a straight face for 3 seconds. 

it turns out that what pulled my pants was a small metal clasp that closes my pants. i hadn't noticed earlier because it was the first day i was wearing those pants while scanning. i should also mention, that the clasp wasn't made of magnetic material, but even when you put non-magnetic material in a powerful magnetic field, the field can affect the metal quite drastically if you move it around in the field. this can be demonstrated by twisting an aluminium plate inside the field - it'll feel like your are trying to twist a wheel spinning at 30 km/h i.e. there's a lot of resistance to every movement you're making (except when moving it parallel to the field lines, but that another story). 

anyway, the participant didn't mention the retarded comment upon finishing the experiment, but i'm sure she'll be relating it to everything with ears (like what i'm doing now).

TIFU by mistakenly coming on to a participant in an experiment I'm conducting.