Makeup on the Metro

An excellent way to save time, or a grooming habit that is better left for home, even when that means showing up somewhere with a naked face?

I've heard of this being discussed before, but I thought I'd bring it to femonomics--along with my own personal spin.

Now, if I'm going to talk about this, I guess I'd better own up: I apply makeup on mass transit all the time. Probably more than I should, because I'm pretty much chronically running late. I can usually get on the bus or train with just enough time for me to skid to a stop at my destination with thirty seconds to spare, but that's usually about as good as it gets.
And I have a lot of skills: I can apply eyeliner on a moving bus or train with no mistakes (or at least, no mistakes the cute little smudging brush on the end of my liquid eyeliner won't fix), and I can hold one compact in my left hand and apply makeup from a second compact in my right. Occasionally, I can even use my reflection in the window for even greater ease of application. And, even more crucial, I'm great at timing it: got a quick commute? Eyeshadow, mascara, and lip gloss can all be done in less than five minutes, and if I've got longer, I add eyeliner, blush, and occasionally (on really bad days) even a concealer.

And don't think I'm the only one! I've seen plenty of other people do this (although they, perhaps, don't do it with quite the same amount of regularity though I don't know, because I rarely ride the same train or bus on a daily basis), and I've even sat next to friends on busy trains, with both of us applying a quick coat of cosmetics.

But I also know there are plenty of people who wouldn't dare do it, who might consider applying a quick coat of mascara to be analogous to clipping ones toenails (which, for the record? I would never do in public. Ewwww).

But what about you, femonomics readers? Brilliant (or at least, necessary) time-saver? A desperation tactic only to be used in the worst of times, i.e. job interview, meeting the in-laws for the first time, noticing you have a huge zit right before a blind date, etc.? Disgusting habit that no one, least of all yours truly, should engage in at all?

I have to say, I'm very interested in what the consensus is going to be. But, uhm, I don't think I'll be stopping today--I'm already ten minutes behind schedule.