I just love going places and giving my resume and having people look over it during an interview process and say those magical words....

Li-Nux? Whatsa dat?

Then I have to explain how in 1990, Linus took unix and make a kernel to work at home...

then they say, what's you-nix?

That's when I know I have to say simply... it's like windows but not.
(Don't flame, I know it's not the best comparison - only way they'll come to some conclusion)

Then they ask something like what's wrong with windows or something....
turns into quite a *fun* conversation.....

BTW, also like it when people see my penguin shirt and start to laugh at the fact I have a penguin on it, until I correct them....

Power to the Penguin!