Here is an oh so simple presentation tool that will cost you all of $30 or less. Keep this with your laptop to projector cable in a handy presentation toolkit and don’t leave home without either of these.
If you are going to present off of a laptop and don’t want to be tethered to the machine – you know, having to walk back to or reach across the table to advance the slides or play the video – then get yourself a wireless remote clicker thing. You will look way smoother.
Sounds obvious? Then cool. You have one? Even cooler. Now, all you have to do is to remember to bring it to the presentation.