My personal favourite would be standing outside the bus wearing Tux t-shirts handing out cds of Linux distros, unless anyone knows of anywhere one could hire a pengiun costume? :)
Once again, I think of "In the beginning was the command line" where the linux distro is compared to people giving away free tanks on a street corner with the offer of free home servicing and repairs, whilst the masses back away shouting "get away from us, you freaks" as they veer towards the ms bicycle with bolt-on engine being sold on the opposite corner...... ;-) Jen.