I once wrote ":tabnew something.js" in my IM window and sent it before I realized that the wrong window had focus. The person replied with, "bash: :tabnew: command not found." I told him, "I was hoping you were vim, actually".
Also using vim will cause your escape key to be heavily hit constantly after typing anything especially if you are not sure what mode you are in, then only realizing you are not in vim period.
Oh, wait . . .
inoremap jj <Esc>