When Indy is in the canals in venice he says they are standing in petroleum and that he should sink a well down here and retire, He lights a torch and ua can clearly see drops of flaming ash fall in the petro...Nothing happens..Then along comes the bad guy lights a match and the thing ignites in a second..And would they also be able to swim in it with there eyes open, Am i missing something? And for that matter would not the fumes ignite? Not an expert on this stuff but the whole thing is hard to except. I am sure this has been discussed here before, I just watched it again with my son and he ask me this same question. Maybe there is an petro expert who has an answer.