I have plenty of stories, but here's the most recent one.
Me (healer) and a guildie (tank) decided to run a quick 55 HM. My operative is moderately geared, whereas my guildie is overgeared, so I figured it wouldn't be a huge issue. We pug for DPS and we get a Sorcerer and Juggernaut. I notice the Sorcerer only has 22k HP, which should have been my first clue. We get Mandalorian Raiders.
Our tank tells the group to LoS the first couple of pulls, since they can be a real pain but this Sorc simply stands and starts shooting the mobs. The first time this happened, I manage to keep everyone up but my guildie makes it clear that LoS means LoS, not standing there shooting. Not a word said by the Sorc.
We come to a second LoS pull (where, once again, the tank says "LoS" before pulling) and yet again, the Sorc sits and shoots lightning. This time, the dogs jump him and I decide not to heal him, therefore causing him to die. The three remaining kill the the mob and I rez the Sorc. Our tank then asks if the Sorc knew what LoS meant - he didn't. We explained it to him and as we were now up to the first boss, we also ask if he knows the fight. He promptly says yes.
We begin the encounter. Our tank pulls the dude away from the 2 dogs and for a few seconds, all seems to be well. That is, however, until I notice what the Sorc is doing. He's running away from the dogs. No DPS whatsoever. Just kiting the dog. The other DPS is doing his best, but this Sorc is running further and further away, causing me to run back and forth to heal. I try asking him what the hell he's doing, to no reply and the rest is rather predictable. Our tank kills the main boss first (despite stopping almost all damage toward the end) and the dogs enrage. Our Sorc dies almost immediately and despite my best efforts, I was unable to prevent a wipe.
I immediately initiate a vote kick, to which the Sorc says something to the effect of "Good luck doing the FP without a second DPS". I promptly remind him that we would be unable to do this content with him as our second DPS anyway, since he isn't DPS'ing, and that finding another DPS isn't hard. He was removed from the group, and we got another DPS almost immediately. Had no issues after that.