Dentistry, but not what you think.
One of my best mates had his wisdom teeth removed ooh, about ten years ago, and he reacted like a big wuss and had to have a week off work looking like the bastard offspring of Sian Lloyd and David Coulthard. Anyway, a couple of weeks later he was shaving. Apparently one of the hairs was quite resilient and got jammed in his razor so he gave it a tug and managed to wrench out one of his stitches which had somehow attached itself to a follicle. I know it seems unlikely but he's not one for the bullshit normally...
( number5 has been fighting tramps and losing., Thu 20 Jan 2011, 14:24, 4 replies)

Hmm
so his hair was growing right through his cheek to the inside and had got wrapped up with a suture? I call last weeks QOTW
(Smale is stuffed, Thu 20 Jan 2011, 14:40, closed)

The other way around...
(according to him) he took it up with his dentist and he was told that it is not entirely unheard of for the end of a stitch to pierce the inside of the cheek and due to the general pain in the area not be noticed until it has poked through far enough to get entangled in the root of a hair. As I suggested, I was skeptical too, but he didn't make a big thing about it and his mum backed him up (he was staying at hers at the time) as she was around when he spoke to the dentist on the phone.
( number5 has been fighting tramps and losing., Thu 20 Jan 2011, 16:38, closed)

Having been to the dentist today myself
I did a little whimper at this.
(WillI'mNot logs in twice a year, every year, Thu 20 Jan 2011, 21:58, closed)

Something similar
When I had a wisdom tooth removed the dentist sutured the inside of my cheek to the gum. It took a couple of years to go back the way that it was supposed to be.
(whiskas loved by 8 out of 10 cats, Tue 25 Jan 2011, 16:58, closed)