I did a little experiment a few weeks ago. Just on a whim, I stood up between the Clark statues one afternoon and read the Gospel of John out loud. Within an hour, someone called the cops on me.
The policeman, who politely shooed me away, explained that reading from the Bible out loud on campus without a permit constituted an illegal assembly, even if I was the only person "assembling." Fair enough. Nevertheless, I found it interesting that someone had considered me enough of a threat to TCU's well-being as to justify police action.