I like to get multi kill medals. You get kill after kill while the announcer keeps saying what multi kill medals.
The medals I like the most are Killjoy and Retribution. It always gives me joy when I end an opponent's kill streak. When I hear KILLJOY, I'm like "Sucks to have to start that spree all over again, doesn't it.". Retribution is just plain fun. What makes it even better is if you kill your opponent the same way he killed you last. For instance, one time I was playing a match on Ragnarok, and I got killed inside our base. After I respawned, I ran back to our base, the dude that killed me and his buddy where still there. I got an Airssassination and a Retribution on the guy that killed me, and a Double Kill on his buddy a split second later. That was the best moment of that match ever. Of all time.
I love roadtrips. I splattered someone with a mongoose, and I had someone on my back, so I got a roadtrip from it. It was sweet.