Not the worst I've had, but I often forget which button I've pressed, 12 is my bypass-Do-not-pass and Pause is my mute, and end up spamming guild chat with "112311121`212```127" a lot.
Or whats worse is the numberpad keys go through to all toons, so when I type I either use the 1-= keys at the top of the keyboard and hope I dont drop totems and dismount, or I use the numberpad, which normally ends up with my guys lined up in single file following the main. Horay for formation macros

I've .. multiple times, accidentally put on bypass-DNP and done /1 blah blah, turned it off, typed in guild then turned it on again to do something on all chars but forgetting to turn it off and talked in guild again. As my mods remember which channel I was just in .. well .. yeh General chat get x4 weird sentences sometimes