Well if you're willing to take the risk of asking someone out if you don't really know them...
Talk to them a bit first, warm up to it before you do anything... then if you really feel like you want to ...just go for it and ask them?
If they are just a stranger then it won't really matter if they say no or you embarrass yourself.. because you probably won't ever see them again!
As for the at work thing, if you really want to, then go for it, the worst they can do is ask you to leave. If they are busy or something they probably won't want to talk too much, but you could always give it a go.
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Well if you're willing to take the risk of asking someone out if you don't really know them...
Talk to them a bit first, warm up to it before you do anything... then if you really feel like you want to ...just go for it and ask them?
If they are just a stranger then it won't really matter if they say no or you embarrass yourself.. because you probably won't ever see them again!
As for the at work thing, if you really want to, then go for it, the worst they can do is ask you to leave. If they are busy or something they probably won't want to talk too much, but you could always give it a go.
Good luck.
If they're a stranger, there really isn't any rules.
Ask as soon as you get the chance.
You trust stangers enough to date them?