Originally Posted by br995
I carry mine on my bars when I'm only going a short distance but already have it with me. For instance, I stopped at the grocery store on the way home. I wore my helmet on the ride from school, but took it off and left it with my bike when as I shopped. Since the ride back is literally 1 to 2 minutes, I didn't bother to put it on.
Why? Convenience? I find it much more convenient (in the same situation) to put it on my head than have it swinging into my wheel from the bars.
Not really in search of an explanation, you are free to do exactly what you want, just seems a little odd.