(stands)
My name is Florian and I have a problem.
Not only do I sometimes drink intoxicating liquids, but I'm also not above nicking the odd ball-point pen at the office, talking idle nonsense or even outright slander now and then, I succumb to unskillful sexual behavior (even if mainly in thought or speech), and I'm apt to willfully swatting mosquitos and other animals endowed with nervous systems. Also, I perform such acts on a regular basis.
(sits down)

The thing about the silas is, they are training rules. Keeping them in mind and practicing them - observing them in practice to see what happens - is what they are for (in my opinion). In a physical training setting, doing fifty push-ups a day will have results, and neglecting that practice will impair those results - that's all there is to doing push-ups. While the silas are rather more intricate training devices than push-ups, I really feel it doesn't help to obsess about having a perfect record, because a perfect record is not the result I'm aiming for: being more kind and compassionate is, and being in a fit state to meditate is.
I think one of the the reasons why the fifth precept is such an object of obsession and controversy may be that everybody realizes the other four simply can't realistically be kept around the clock by human beings living in society, but the fifth one can - it's definitely possible to live in society without drinking alcohol.
I hope my comments are taken as the hard-won food for thought they are, not as justification for breaking the precepts.

Cheers,
Florian