You can see it comin'!! I had squeezed a 19mm wrench on...only fit about halfway on the bolt head...and was cranking the crap out of it. Wrench slips off...both it and my fist wrapped tightly around said wrench hit my face with no small amount of force...like most things...in slo-mo..."Awww, crap...that's gonna leave a mark but no time to move...!" Split the lip good and did rock me back a wee bit...though Pop taught us to never go down or IF you do, get right the h*** back up!
I got the bolt out with an 18" extension & impact (whacked the socket on!)...When I talked to the brother I "thanked" him for not using the right flanged bolts...response was "What...probably used a f'ing deck screw?!?" Yeah, he doesn't much like rowing the gears...this modded-up T5 came out for a C4 in his 'Stang...
No pics, sorry...!
And tomorrow is my wedding anniversary so I'll enjoy gumming supper!! Ah, it's all good...wouldn't be workin' on the car if something didn't get dinged or scraped!! 
1966 caliente,428 4 speed,4.11 gears,nitrous,parachute