Yvain's salmon analogy has drawn some criticism. I have to agree that it is not a perfect analogy. Analogies rarely are perfect. The best course, I find, is to offer a choice of analogies and let people choose the one with the most resonance. Pick one from this list:

Photoshop the Queen with a salmon day. We don't need to surgically alter the Brits. Just have a bit of fun with their national symbol. If insulting the Queen doesn't work, try Lady Di.

Tell an ethnic joke day. Stereotyping can be funny and is never physically harmful. If an ethnic group is capable of making fun of itself, then everyone should be able to make fun of them. It is all just in fun.

Use a bad word day. Isn't it ridiculous that people get offended at the use of certain four letter words - particularly those denoting body parts or normal biological functions. Isn't it clever to make people angry when they are unable to justify their anger rationally?

Let it all hang out day. And some people are offended not just by hearing about body parts, but also by seeing them. The occasional practice of public nudism (weather permitting) will help to make the world a better, less neurotic, place.

Use racial epithets day. Sticks and stones can break your bones, but words can never hurt you. Some people, though, don't seem to realize this. It is time to confront their irrational viewpoint that speech should not be completely free.

Desecrate a religious symbol day. Don't draw Mohammed - he already has a day. Instead, burn a Torah, feed a sacremental host to rats, pull the pins out of a voodoo doll. Lets show some imagination here. What can we do in Delhi to a sacred cow? Catapults can be fun.

Piss in someone's vegetable garden day. Some people have the uninformed impression that human urine is unsanitary. Not true, it is actually a sterile medium. People in India sometimes consume small quantities of their own urine much as people in the West drink herbal teas. Its time to dispell this anti-urine superstition.

Barbecue a cat day. Confront dietary prejudices head on, and also lend a hand to the Humane Society in addressing the cat overpopulation problem. Actually killing and butchering the cats publicly provides a more vivid demonstration. And as an added benefit, leading people to care less about kittens will make the internet a more productive environment and may even increase contributions to the SIAI.

I have to admit that if I actually encountered one of the protests on this list in real life, my initial reaction would be amusement. Repetition might change that to annoyance. But only one of those ideas actually offends me. Which one? I won't tell. YMMV.