The yellow card was during the referee's instructions, where Jackson mimed as though it was stinky, and accused the ref of breaking wind. Then he pulled out the yellow card and held it up to the official.
I could only get two off the top of my head. I'll leave the rest open for others.
Dan Henderson (vs. Rampage and Anderson Silva)
Kenny Florian (vs. Sean Sherk and BJ Penn)
Could have sworn Dan Henderson was incorrect, remembering him beating Newton in a championship fight. But then I went and looked it up, and it turns out it was just a tournament, it wasn't for the middleweight belt - Shamrock had it at the time.
There were a ton of other quick ones too, Aleks' fights against James Thomson and Ricardo Morais, Azeredo vs Kotani, Kang vs Ninja were all 10-20 s I think. Not sure if anyone else cracked the 10-second barrier.