"I'm not sure of the physics, but..."

Is it just me, or does every harebrained scheme e-mailed to Danger Room contain some version of the phrase above? As an employee of a famous learned society, I have been favored with one such e-mail myself, proposing a method of time travel, and it also contained a similar admission. I'm not terribly informed of physics myself, but that doesn't seem to be as stimulating to my imagination as it is to some others.