Because "to bob" means to move up and down, and when hair is cut short in a bobbed style, it does just that whenever you move.
A buzz, bob, or shave
A pageboy, bob haircut
Lucy Worsley's current hair cut is called a simple bob.
A bob haircut was a style that was worn in the 50's A bob haircut on a guy is not an up to date hair cut. Look at some style magazines to get some ideas.
The swing bob is the most popular haircut
There is actually no real definitive best color for a bob haircut, it depends on the user. Take your favorite color and go wild on your bob today!!
A buzz, bob, or shave
it's a wolf cut (asian wolf haircut or just layered hair) shorter in the top and longer on the bottom it's like a bob cut with long hair =]
I personally think that a bob haircut can look great on men, if worn in a scruffy alternative way, especially in a side parting.
angled bob
Bob
Jody Foster