Just got 2 luck based Zombie trophies in Black Ops:
See me, stab me, heal me
We did it in our 2nd game, and I was really, really lucky!
I got monkey bombs in my first mystery box try and the crossbow as 2nd try.
I got the balistic knife as the 4th or 5th try.
I was really lucky and I'm happy I got these trophies