So, I just saw this over at Cracked.com.. do you have any topics they might have missed?
Here are the topics they list as guaranteed to start a fight on a forum (my thoughts are in parentheses):
1. Declawing Cats (If you need to declaw a pet, you probably shouldn't have it)
2. To Tip Or Not To Tip (I'm generally against it unless the waiter/ess does an exceptional job or manages not to annoy me)
3. Does 0.9999 = 1? (Never heard of people arguing over this AND no rounding up for me, please)
4. Circumcisions (Free band-aids for everyone!)
5. Veganism (If God had wanted us to stick to a vegetable only diet, He wouldn't have made Burger King)
6. Dog Poop: To Scoop Or Not To Scoop (It's bio-degradeable, give me a break

)
So, did we miss any taboo subjects?
And, the link to their article (contains crude humor, crude language):
6 Innocent-Sounding Topics That Are Guaranteed Flame Wars | Cracked.com