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I've used probably all of the methods here at some point in my life.
I had to use an extractor to get out one of my lifter carrier bolts (which is also a socket head cap screw) and it worked well. It's not perfect and you need to get a really good bite on your first try or you'll just chew more metal.
If you're on a road trip you don't have an extractor. So...
Jamesp method of using a dremel to put a slot in it will work every time if you can get access with the dremel. In the case of my lifter carrier I likely would have nicked the carrier and that's not a place one accepts collateral damage.
One of my all time sure fire methods to remove a fastener which is FUBAR is the one suggested by derfo. A good punch and a hammer will remove any bolt, any size, anywhere. I learned of the trick 30 years ago in the VW manual for the complete idiot and it flat out works.
A surprising number of times the fastener will still be useable (if you're in a jam. I'm not suggesting an OCD Porsche^tm owner ever reuse a fastener. Strictly mad max here). Like the dremel method, getting a good angle on things.
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