Unfortunately, I've seen many things integrated in to clients at the local level become "law" for channel ops...
* mIRC ships with graphical smilies turned on.
* People abuse channels with

* No one bothers to stop and think "Hey if that feature bothers me I'll just turn it off."
* Kickbots configured to kick on all instances of smilies.
* Friendly new user innocently ends sentence with

* Ops say it is his fault.
* Thus ends friendly new user's expedition in to his new found world of IRC.