There is one thing about the two Total Recall movies which I have wondered about all the time.
In the original film a doctor came to Quaid to try to persuade him that he is not in reality but stuck in a memory. The doctor had nearly succeeded, but when Quaid saw a bead of sweat, he immediately knew that this is reality. In the remake it was the same setting, but his best friend and tear.
How could he be sure that this was reality only because of a bead of sweat or tear? As far as he knows, the implanted memories are super-realistic, and seeing someone sweat or cry should be no proof that this is reality. So is there maybe an explanation in the book or somewhere else (or I missed it in the movies) why he is sure that this is reality only because of a bead of sweat/tear?