I played with zzirgrizz back from cod4, and OpTic Preadator from OpTic Gaming.
Most memorable one was having tulegitimate and T2 on my team and walshy and naded on the other team. Legit watched me out br naded on his first 2 and he asked if I was going to fileshare it.
Don't know if they count but I have played with RippinHeads and a Bungie Developer.
I have played like every MLG pro there is , 2 bungie employee's and I played the real Souljaboy ( Celebrity , GT : Souljaboytellem)
Machinima open lobbies, when my xbox wasn't banned, i played with a few youtubers
the only people i played was with Ghostayame and Tizoxic(MLG Pros)
I played with you. Does that count?
For me the most famous person i've played with is ghostayame and a few other youtubers/streamers.
I played with CS 1.6 Bots.
I played with rippin heads in double xp 2 in halo