Name a ribbon you got legit, whether it be on purpose or by accident, that most people boost, and how you got it.
Good examples include: No Smoking, Under the Radar, Team Savior, Trick Shot, Reconnaissance, The Super, Hat Trick.
I got my Trick Shot when I was boosting the execution unlocks (I think it's 40 kills to unlock the execution...) on KOTH, Mercy, and I had previously got a triple "Kaboom!" so I fired a Torque Bow in the direction of where they spawned and by chance happened to Trick Shot.
Team Savior I got somewhere during the process of getting the Motivator Onyx Medal. I just recall seeing it when I went to check my new ribbons, don't recall getting it. I think it was Wave 4, though, most people were still on the Drones.
Reconnaissance I got also by accident. It was a Berserker Wave, and the person fighting was the Last Hope ribbon earner, so I kept tagging the Scorchers for him to use. Amazingly he actually won the round, and I got the ribbon 3 times. :3
Pop Goes the Weasel a lot of people seem to have trouble with. I've gotten 6 legit, and one of them was actually a quad. I was trying to down a bunch to lure out all of them to one point, and decided to go ticker after being killed. 2 were up and two were still crawling, and I just sat around until one of them shot me.
Boosted the rest, because I'm a total noob and a bit of an achievement whore. But what about you?