Most of you probably know about this, but if not, i've found it to be a great way to interject a little humor into a long lecture (or a long day).
Draw a box on the page and instead of using command K (mac) to delete it, use shift option command K. You'll get a little alien that marches out and laser blasts the box to delete it. In 4.0 if you continue to do that (delete, undo, delete, undo) somewhere between the 5th and 12th time a large alien will come out with a bigger gun and delete the box and, sadly, the little alien as well. - nichole
Draw a box on the page and instead of using command K (mac) to delete it, use shift option command K. You'll get a little alien that marches out and laser blasts the box to delete it. In 4.0 if you continue to do that (delete, undo, delete, undo) somewhere between the 5th and 12th time a large alien will come out with a bigger gun and delete the box and, sadly, the little alien as well. - nichole