The Movie Job: Being one of the experimental military scientists in charge of sending people repeatedly back and forth to avert various moments of catastrophe - as seen in this year's Source Code.
Desirable Position? Nothing too crappy about it, really - although clearly there's a bit of moral wrestling to be done over the idea of forcing some poor bloke to experience his own demise 30 times in an afternoon.
If It Existed In The Real World: We'd imagine the entry exams would be fairly tricky. Also, the hours are long - although you might be able to reassign them, too - and the frustration levels must be positively hairline-wrecking. We'd be looking for at least a swish company car to sweeten this deal.