Yes.

It's specific to driving a car. "John was behind the wheel when the accident occurred." Or, "Don't get behind the wheel after you've been drinking."

1. "Money" or "finance" usually refer to work in the banking industry. 2. You may say both "march on Washington" or "march in Washington." 3. "Now, get!" is like saying "Go away!" It's even less polite than saying "Leave!"

I agree with David, however, it is directive, so if you are the person running a meeting or teaching a class, it's quite acceptable. If you're saying it to a group of peers with whom you are collaborating, it's equally acceptable. If you say it to someone who is perceived as your superior (teacher, boss, etc.), it's jarring and possibly perceived as inappropriate.