Corrected entry: In the scene where Linus is showing David the plastic, Linus borrows David's lighter and lights it under the plastic sheet and says "Doesn't burn. Doesn't scorch. Doesn't melt." But when he asks David to taste it, you can see a black mark when the lighter has scorched it. Linus then walks across the room and put the plastic back into it's holder, the black mark is mostly gone but you can still see a smudge. Later at the party Linus is doing the flame test again for a roomful of men, the same thing happens, he puts the plastic to the flame and it scorches.