Really confuse them, use Opera.
That's what I always use at work.
Now to really, really confuse them, use Lynx.
Now then to REALLY, REALLY confuse them, try getting one of those evaluation CD for Linux, and run that. I tried it once at work, (SuSE 9.0 to be exact) and to my amazement, it worked like a charm, got right out on the internet through the firewall without even loging into the NT network. The damage someone who wanted to do could have done......