SMEAR YOURSELF IN JAM IN THE CHANGING ROOM IT'S WHAT THE PROS DO
An extension to this is to ensure you're going to have an ample supply of intestinal gas (e.g. eat a few catering size tins of beans a half hour before the session), so you can "honk" the person in front of you, so they know to get out of your way, because you're a Speed Demon. Signalling ensures the person behind you will wait their turn before attempting to overtake you. This practise is only common at the highest level of the sport, which is why you may not have heard of it before.remember to signal if you are going to overtake.
Probably a question better suited to the sports forum.
GD answer - attach blades to your arms.
The thing that always bothers me is when you see someone swimming that you recognise. Having said hello the first time that you go past them, do you then continue to acknowledge them, or do you just ignore them each time you pass them again?
You've gotta appreciate the irony that they where all sensible answers till you posted...