While not necessarily that interesting, I do have 15 Backstabs in a Dead Man's Keep
, which is a video of me getting 16 kills in onr life on cp_degrootkeep, 15 of which were backstabs.
Actually, I may have a new replay from a few days ago where I got 17 kills in one life on the same map. <3 Degroot Keep.
Edit: Never mind, apparently it didn't capture that one. >:/ In fact, it looks like it captured the next life. Did Valve change that behavior at some point? (I didn't hit F6 until I respawned, whoops)