I wouldn't even consider driving away with $50 dollars of petrol for $10. I wouldn't even bother complaining.
I'd let him know that i had only asked for $10 and then let him of the hook. Life's too short to make a big deal out of this stuff.
(i would have pumped my own fuel in the first place so i guess its moot anyway)
Sucker born every minute, hehe.
As I mentioned in an earlier post, there are people who do these 'mistakes' to increase their sales. Using a kid to do it leaves them far more wiggle room to claim innocent mistake.
Granted, this is not a common scene, but at least one should question the incident and not merely assume innocence. I guess that's part of these morale compass questions that i'm struggling with, insufficient information.
For example, in my claim of not wanting to sacrifice my "true love" for the lives of others, as others pointed out, I didn't provide clarification of "who" those others would be, nor of the circumstances I may be in that would cause me to react in such a definitive manner, nor of the emotions associated with the event that would interfere with a logical examination of the incident. My statement was a gut reaction, not a logic-based reaction. I grabbed from history to reexamine something and came with "how my mindset was at the time." As I mentioned earlier, I'm a pragmatic, mostly logical man, but emotions can and do override logic, pragmatism.
What I'm trying to say, and reiterating what godsarseii indicated, our moral compasses are not fixed-states; they vary according to the wants, needs, location and circumstances. You just can't pin it down, no neat packaging, no simple answer.