There's quite a bit of gravity involved in a physicist's job. But that doesn't mean they can''t have a little fun, too.
Physicists are the geeks...er...um...guys who attempt to explain how the physical world works. They ask questions and then go about finding the answers. What are the immutable laws of nature, and what are the more mutable laws of nature that can be fudged slightly? How does matter interact and why does it behave the way that it does? Why does it…matter? How fast can we make a particle travel, and if it gets loose, could it break my windshield? (And is it covered by my insurance?)
While some physicists work in the theoretical realm—asking these broad questions so that we may better understand the world around us—others have more practical aims, such as expanding our technological base of knowledge to allow for the creation of advanced medical equipment, electronic devices, etc. The former are much more likely to be wearing tie-dye at any given moment.
It takes an inquisitive, mathematical, and scientific mind to become a successful physicist. But if that sounds like you, go for it, because you’ll be rolling in it—especially if you work for the Federal Government. They may not pay their postal workers all that much, but that doesn't mean they’re always tightwads.
Because physics encompasses such a broad area of study, and because an advanced knowledge of physics extends into so many different fields, few physics grads with only a bachelor's actually end up holding the title of "physicist." For the most part, they work in the private sector, often as an engineer, computer scientist, or physics teacher at the high school level. However, when asked by a stranger, they may still respond that they are a "physicist." You should just let them have that.